Thank God - literally - that the Orthodox lecturer (and later bishop) under whom I studied at Glasgow did not share the same opinion, and that ecumenism was his great passion. He shared fellowship in Christ with CofS, Congregationalists, Baptists and Independent Evangelicals without batting an eyelid. He used to drive a rather reprehensable VW beetle - with the car sticker "All one in Christ Jesus!" Works for me!
He sounds good, would work for me too.