I sing in a mostly catholic choir, and I don't bother arguing religion there. We've had discussions over beer with somewhat theist friends. The only real serious discussions about religion I had in the US. For example when the youth pastor of the local church asked me what my beliefs were
After I had finished he said, well at least you're pretty transparent in what you believe. I guess he didn't expect a detailed answer.

The fool hath said in his heart, There is a God. They are corrupt, they have done abominable works, there is none that doeth good.
Psalm 14, KJV revised edition