When my daughter was six, she said to her very religious grandmother, "grandma, when I stay at your house on the weekend, I don't want to go to church with you because I don't really believe in god." Her grandmother's a really sweet lady, and the most open-minded evangelical I've ever met, so she was fine with that. We just didn't have her stay over so she'd be there on a Sunday morning from then on.
Cut to a couple of weeks ago and my now 14-year-old daughter apparently was talking to her grandmother about book banning and Louisiana forcing school classrooms to display the 10 commandments. We told her those were probably not the best subjects to talk to her grandmother about, but her grandmother later told my mom that she thinks my daughter is really smart.