Ultimately, “choose” is the big word, and your child eventually will.
My son’s trajectory was an interesting one. I’ll try to be brief:
Me: Went to United Presbyterian Sunday School fairly faithfully as a child and church in my pre-teens, but neither my parents nor my grandparents went to church more than a couple of times a year. Liked the pastor and his wife (my SS teacher) a great deal, but I don’t think a whole lot of it “took.” By my teen years, my grandparents had moved closer and joined a United Methodist church, but their attendance was sporadic, and mine correspondingly less so. Once I entered college, it reduced to zero.
Ex-wife: Raised Catholic, but I don’t think she attended very faithfully, and zero by the time we were married. When our son was born, she suddenly got the notion that we should join a church so he could be baptized. I went along with this: we attended one Catholic service, at which I felt very out of place, and at her instigation ultimately joined a Lutheran church, and our son was baptized. Again, I liked the pastor a lot and dutifully went to classes, etc., but didn’t really feel a part of it all (entirely my fault…everyone was very nice). Funnily enough, my wife fell away from it before I did, and we were churchless the last seven or so years of our marriage.
**Son: **I believe we walked away before our son ever got to the point of attending Sunday School…I can’t recall for sure. His mom and I divorced when he was 9, she remarried and got involved in her next husband’s church. My son attended there fairly faithfully for a while and seemed to get into it, but by his teens he had fallen away. Ironically, he went to college and got a degree in religion! I’ve always explain jokingly that he’s just as big a heathen as his dad, but that he finds the study of religion…all religions…to be interesting. He, of course, now also has a virtually worthless degree, and will be getting his Master’s in a completely different discipline, but he will always maintain this interest. His studies have shown him that there’s value to be found in parts of many religions, but I would describe him as I describe myself, an agnostic who respects everyone’s beliefs as long as they don’t foist them upon others.
Bottom line…once they’re old enough to more fully grasp things, I think you owe it as a parent to be honest with your kid(s) and say “This is what I believe, but your beliefs will ultimately be up to you, and we’ll love and support you no matter what they turn out to be.”
In the meantime, exposure to many different kinds of thoughts and beliefs seems like a good idea to me. I’m not a religious person, but that doesn’t mean I don’t think about all of the issues that religion touches upon a lot.