Below is just one of many things a church must agree to, in order to
paricipate in the WCC.
http://www.oikoumene.org/en/resources/d ... to-alegre-
2006/1-statements-documents-adopted/institutional-issues/constitution-
and-rules-as-adopted.html
4) The church recognizes the presence and activity of Christ and the
Holy Spirit outside its own boundaries and prays for the gift of God's
wisdom to all in the awareness that other member churches also believe
in the Holy Trinity and the saving grace of God.