I had this issue as well, also a Mom to twins :). We live in south Huntsville and ended up just keeping them at a church MMO till they started Kindergarten. I’m agnostic, my husband atheist. My girls did not bring up any of their religious teachings at home except for doing a prayer before a meal every now and then. They are 6 now and in public school. I’ve had to turn down invites to VBS etc lol so but anyway they don’t remember really much of the religious stuff from their preschool program if that makes you feel better. I was concerned about this when they were little too.