Answer:
Yes. They may not announce it to the church. They may not even tell it to the one(s) they love. But yes.
I'm sure the loved's response varies based on the situation. I am grateful that (atheist) list boy comes to church with me. The people that know him are humored by it. The people I've told at church are initially confused by it and then supportive.
I'm not trying to convert him. I am trying to share a part of myself that is foreign to him. He started coming to church with me without my asking him to. He invited me to the worship he attended as a child, despite obviously not attending anymore. It reassures me that while we have deep religious differences, he can be open to mine. If anything, I need to learn how to be open to his.
Not sure how our parents will handle all this.
I haven't mentioned it to mine.
Can't really tell what his father knows.
I'm trusting everyone to trust us.