>> Entire congregation should have stood up and silently left the church service en masse.
I can assure you that they didn’t disagree with him “en masse”. Many approved.
“...just as they did not think it worthwhile to retain the knowledge of God, so God gave them over to a depraved mind...”
You are correct, of course.
But even only a fraction of the congregation leaving in cold silence would certainly have disconcerted the remainers.
Regards,