I rumbled Santa and religion before I was 6 and I really thought until I got to high school that everyone knew both were tosh but just Yes, Virginia pretended for kids.
I thank my parents for *never* mentioning *anything* to do with religion. I think they had faith of some sort but they were determined that I should make up my own mind.
I have no idea if *any* of my teachers were religious and I thank them for their profound professionalism. It honestly never occurred to me that people really believed any of that stuff when the things in my school and local library books were so much cooler.
I am atheist because I was allowed to make up my own mind. This was one of the many advantages of growing up during the 70′s in New Zealand.