Can two walk together, except they be agreed? (Amos 3:3)
Founded in 1948 the World Council of Churches (WCC), is an international, interdenominational fellowship of Christian churches that was proclaimed "a fellowship of churches which accept our Lord Jesus Christ as God and Saviour" at the 1948 inaugural assembly . Based in the Ecumenical Centre in Geneva, Switzerland, they are made up of some "350 member churches who together represent more than half a billion Christians around the world."
WCC member churches can be found in all regions of the world and include most of the world's Orthodox churches (Eastern and Oriental), as well as African Instituted, Anglican, Assyrian, Baptist, Evangelical, Lutheran, Mennonite, Methodist, Moravian, Old-Catholic, Pentecostal, Reformed, United/Uniting and Free/Independent churches, Disciples of Christ and Friends (Quakers) 
The Encyclopedia Britannica says "The WCC is not a church, nor does it issue orders or directions to the churches. It works for the unity and renewal of the Christian denominations and offers them a forum in which they may work together in the spirit of tolerance and mutual understanding. 
And, in their own words, (Emphasis added)
All WCC programmes aim to support the member churches and ecumenical partners to journey together, promoting justice and peace in our world as an expression of faith in the Triune God. 
The Trinity - Biblical Doctrine or Man Made Tradition?
However, in reality the WCC seems to be miles removed from "a fellowship of Churches which accept Jesus Christ our Lord as God and Saviour" with the mission of "promoting justice and peace in our world as an expression of faith in the Triune God".
According to the Gatestone Institute, a non-partisan, not-for-profit, international policy council and think tank, "after the retirement of its founding spirit, Willem Visser't Hooft, it drifted away from its original concerns, a development that accelerated after his death in 1985." 
In fact, according to an article by Dr. M. H. Reynolds entitled The World Council Of Churches - An Ecumenical Tower Of Babel says their "doctrinal basis" is meaningless because as an official WCC document goes on to explain
"Since the World Council of Churches is not itself a church it passes no judgment upon the sincerity with which member churches accept the basis." Document 24 (Appendix 111) of the WCC Central Committee Meeting of August 22-29, 1973, specifically states: "The World Council of Churches has no common confession. It is a fellowship of churches confessing Jesus Christ each in its own way."
I would suggest reading the article in its entirety HERE
The truth is that the WCC tolerates an enormous number of heretical beliefs - the ordination of women and practicing homosexuals just the tip of the iceberg. (This reminds me of Jesus' words "Why do you call Me, 'Lord, Lord,' and do not do what I say? (Luke 6:46)
The 1993 Re-Imagining Conference
Attended by some 2,000 women "seeking to change Christianity", the Re-imaging conference in Minneapolis, Minnesota was sponsored by the World Council of Churches growing out of their Decade of Solidarity with Women
Sponsoring and participating denominations included the United Methodist Church, United Presbyterian Church, Evangelical Lutheran Church in America, United Church of Christ, United Church of Canada, Church of the Brethren, American Baptist Convention, Episcopalian, and Mennonite. There were also 234 Roman Catholic participants.
Speakers included Chung Hyun Kyung, Korean "theologian" who equates the Holy Spirit with ancient Asian deities; Virginia Mollenkott, an avowed pro-abortion lesbian; Elizabeth Bettenhausen, professor at Harvard Divinity School; Lois Wilson, a United Church of Canada "minister"; Jose Hobday, a Roman Catholic nun....
Eighteen times Chung summoned the spirits of the dead and claimed that "without hearing the cries of these spirits, we cannot hear the voice of the Holy Spirit." Chung said, "I hope the presence of all our ancestor's spirits here with us shall not make you uncomfortable.” She also summoned “the spirit of Earth, Air, and Water.” Chung said, "I also know that I no longer believe in an omnipotent, Macho, warrior God who rescues all good guys and punishes all bad guys.” Chung concluded her message by likening the "spirit" to the idolatrous image of Kwan, "a goddess of compassion and wisdom (worshipped in) East Asian women's popular religiosity.” Chung went even further in her blasphemy when she said, "Perhaps this might also be a feminine image of the Christ who is the first born among us, one who goes before and brings others with her.” 
,At the conference in Minneapolis "the deputy general secretary of the WCC, Mercy Oduyoye, taught that we all have "spirit mothers" who avenge us and that the spirits of the dead surround us "in the rustling of trees, in the groaning woods, in the crying grass, in the moaning rocks." The same conference also featured Kwok Pui-Lan, a WCC member who defined salvation as "bringing out what is within you" and quoted the Gnostic gospels. Pui-Lan justified her use of Gnostic texts by stating that, since it was men who decided the canon of the Bible, she was not obliged to accept it. 
While I know nothing about their beliefs, The Brethren Revival Fellowship presents some very disturbing facts about the 1993 conference. Here are some excerpts from the article (All emphasis added)
Re-shaping Christianity: "The entire Conference was an assault on the Gospel and a trampling under foot of key tenets of the Christian faith. The new religion promoted at the Re-imagining Conference soundly rejected the incarnation of Jesus, as well as His atonement on the Cross. The reporter in the Minneapolis Star Tribune, said that the conference leaders were "re-shaping the Christian understanding of [the] foundations of theology." Participants and speakers alike angrily denounced the Christian church, charging that its teachings about Jesus Christ constitute the chief source of women's oppression, human violence, racism, sexism, classism, and the abuse of the earth.
Faye Short, in the United Methodist Good News magazine, says that the Conference speakers praised every imaginable religion or spirituality except orthodox Christianity, and recognized the power of every deity except Jesus Christ...."
The Atonement: "Delores Williams, a professor at Union Theological Seminary in New York, told the group, "I don't think we need a theory of atonement at all ... atonement has to do so much with death ...l don't think we need folks hanging on crosses, and blood dripping, and weird stuff ...we just need to listen to the god within." Another speaker, Virginia Mollenkott, who serves on the National Council of Churches commission to prepare an inclusive language lectionary, claimed that the death of Jesus was the ultimate in child abuse. She said that the commonly accepted view of Christ's atonement pictures God as an abusive parent, and Jesus as an obedient child."
Monism: "Speaker Chung Hyun Kyung drew many of her ideas from Eastern pantheistic religions, in which God is an all-encompassing energy force uniting and permeating all that exists. Chung led the delegates in an exercise that she called "pranic healing," and said that "this life-giving energy came from god and it is everywhere; it is in the sun and in the ocean; it is from the ground and it is from the trees...lf you feel very tired and you feel you don't have any energy to give...go to a big tree and ask [the] tree,'Give me some of your life energy.'"
IPS Note: Chung Hyun Kyung is a lay theologian of the Presbyterian Church of Korea, and is also an Associate Professor of Ecumenical Theology at Union Theological Seminary in the United States. See Footnote on Monism
Sophia: "One of the most disturbing aspects of the Minneapolis gathering was the worship and adoration paid to Sophia. The Greek word for "wisdom" is "sophia," and the name "sophia" is a feminine name. At the Re-imagining Conference, as each speaker took the podium, she received a chanted blessing from the entire assembly. The women chanted, "Bless Sophia, dream the vision, share the wisdom dwelling deep within." Those who promulgate Sophia-worship claim that they are using "Sophia" as just another name for God, and that they are simply trying to show that there is a female side to God. From their point of view, God must no longer be referred to by male names alone. Speaker Barbara Lundblad raised a few eyebrows when she declared that she "did not need Jesus" as long as she had Sophia.
Lesbianism: "During a workshop entitled "Prophetic Voices of Lesbians in the Church," one speaker said that the biblical Mary and Martha were not actual sisters, but lesbian lovers. One presenter at the Conference concluded her speech by declaring that her theology is first of all informed by "making love to Coni" her lesbian partner. At least ten of the 34 speakers at the Minneapolis Conference identified themselves as lesbians.
And there is more - plenty more See Paganism At The Re-Imagining Conference In Minneapolis (1993) HERE
Also See Feminism and The Bible
Radical feminists, not only reject historic Christian orthodoxy in favor of neo-paganism and goddess worship, but realizing that in order to change a civilization built on the Bible, the very Bible must be changed. Much of the problems stem from the doctrine of male head-ship... one of the most controversial subjects in the Scripture. Feminists are quite convinced that Head-ship = domination and Subordination = inferiority and denigration. Unfortunately both feminists and an altogether too large a number of traditional church leaders have myopically focused on what they think is Scripture's treatment of, and instructions regarding, the sexes, with complete disregard for what the Scriptures actually reveal. What is certain is that the Biblical concept of male head-ship has all too often been twisted to generate horrible evil.
The WCC and The Catholic Church
Although the Catholic Church is not a formal member of the W.C.C, (because of divergent visions on doctrinal, moral and social questions)
various dicasteries of the Roman Curia collaborate in some of its working groups and commissions. A joint working group between the W.C.C. and the Catholic Church was established in 1965 as one of the first fruits of the Second Vatican Council, and over these past 50 years relations have improved considerably". 
One of the many areas of cooperation is between the church and W.C.C. team is in inter-religious dialogue and cooperation.
On June 21 2018, Pope Francis -the third pope to visit the W.C.C. headquarters - was present for their 70th anniversary celebrations. He was preceded by Pope Paul VI who went to the council headquarters on June 10, 1969 and who hailed the W.C.C. as "a marvelous movement of Christians" and by St. John Paul II who visited twice in 1982.
"On the eve of the pope's trip, Dr Fykse Tveit, a Lutheran pastor of the Church of Norway and general secretary of the WCC since 2010, described Francis' visit as ‘a strong signal of recognition by the Catholic world; a signal that there exists a worldwide ecumenical movement, in which the Catholic Church participates.’" 
Footnote I - Monism
Monism is the view that reality consists of one fundamental, ultimate essence. It comes from the Greek mono, which means one. All is one thing, one essential substance; hence, the term substance monism. Therefore, in monism, God, if he exists, and the universe are the same thing. This would mean that energy, motion, matter, thought, consciousness, etc., are all of one substance. However, they are perceived differently. They appear as different things though, in reality, they are ultimately the same essence. Therefore, monism is a fundamental part of the philosophy of pantheism which teaches that all existence is part of the nature of God.  [PLACE IN TEXT]
 The basis of the WCC. https://www.oikoumene.org/en/about-us/self-understanding-vision/basis
 World Council of Churches https://www.oikoumene.org/en/member-churches
 Encyclopædia Britannica, Inc. https://www.britannica.com/topic/World-Council-of-Churches
 World Council of Churches https://www.oikoumene.org/en/what-we-do
 Malcolm Lowe. What Is the World Council of Churches? Gatestone Institute.
 David Cloud. Way of Life Literature The World Council of Churches. https://www.wayoflife.org/database/wcc.html
 What is the World Council of Churches? https://www.gotquestions.org/World-Council-of-Churches-WCC.html
 Gerard O’Connell. America: The Jesuit Review. June 20, 2018. Why Pope Francis’ presence at World Council of Churches matters. https://www.americamagazine.org/faith/2018/06/20/why-pope-francis-presence-world-council-churches-matters