You are absolutely correct, except the Marxists infiltrated back in the late '50's or early '60's.
This is indeed the poisoned fruit.
Read up on the World Council of Churches or the National Council of Churches. It'll flat curl your hair.
There's plenty of athiest clergy right here in the United States. We saw many of them rallying for Kerry last year, and then there's that 'Separation of Church and State' group that says they are clergy, when in fact they are athiests.