Yes, this sometimes happens to me too. It's very annoying indeed! Especially in the beginning of our relationship and when I felt she was quoting questions and answers from a manual! I wanted to slap her :-) it's better now when we know each other better.
Unless she is an official Christian counselor or it is somehow obvious she specialises in spirituality, she has no right to discuss religion at all! You have a right to say no to that and if she keeps mentioning religion then say goodbye to her.