You have no grounds to accuse me of lacking integrity in the way I applied the passage. If marriage is a union of two - so to is a joining of two organizations. Paul's citation in 2 Cor does not single out marriage or even mention it does it?
Paul means much more here than only marrying an unbeliever (you must read the passage in its whole context). It really applies to any environment where we let the world influence our thinking. When we are being conformed to this world and are not being transformed by the renewing of your mind (Romans 12:2), we are joining together with unbelievers in an ungodly way.
finally, ecumenical efforts in the past have always been liberal - not conservative - in origin - and is evident by the National Council of Churches - one of the most liberal religious organizations second only to the World CC.
Surely your not asserting that defending traditional marriage and protecting the unborn are liberal issues, are you? These are the issues over which the Catholic Church and the Mormon Church have joined together to protect.
Please provide documentation of the Mormon Church using past ecumenical efforts with the Catholics to specifically advance its missionary efforts. I don’t want antecdotal stories, but proof that the Mormon Church’s has a stated policy of concertedly engaging in ecumenical activites for the purpose of furthering its missionary efforts.