I just started going to church, my son stays with me on weekends, ex is an aganostic advice please?

An Agnostic would have no trouble with you taking the son to church. Agnostics believe there may or may not be a God, they are the fence sitters of religion and generally open minded. Now, if your ex is an Atheist, she'd have issues with that as they do not believe in God. Figure out which of these descriptions fits your ex best and you'll be able to sort the Answers here a bit better.