I have never brought it up myself but my T did one time, which surprised me/caught me off guard (but it makes sense why she did). We were discussing my need for control, how I hate feeling out of control, etc. She began to ask me questions about my faith, asking how it affected my relationship with God if I felt out of control, how I am able to have faith when I don't have all the answers, etc. (She did already know I go to church because I had brought it up in passing, like "my friend from church said..." etc.)