***The Gospel, do you believe in the Trinitarian understanding of God. If you hold these as firm beliefs we can argue all day, but we are still Brothers and when someone asks we should be ready to preach The Gospel.***
AMEN!
I think it is as simple as saying "Christ crucified". If someone doesn't understand, or mocks the Christian who says this we know. If a church does not believe this is sufficient (adding to The Gospel) we know they are not with us.