I’m atheist and my parents raised me without any religion. The first time I learned anything about religion was at primary school where Christianity was taught as fact. I was really confused as to why I hadn’t heard of this “god” fellow before now, and I asked my parents about it, and they explained the general concept of religious belief to me, and said that I was free to believe whatever I choose, and I remember being frustrated that my mum wouldn’t directly answer me as to whether or not this stuff was real or not real, and kind of just settled on the idea that it was like they read the Chronicles of Narnia and believed Aslan was real, which was like, fine with me, but seemed a little silly. It was kind of funny to learn a bunch of religious stuff in retrospect - it was kind of like, “dang, this Jesus dude really does force himself into everything doesn’t he?” Easter is the funniest one, it’s such a stretch, they clearly had no idea how to make that one about Christianity and just kinda phoned it in.
So, the one “religious” thing I keep, is saying stuff like “oh my god”, “for god’s sake” and stuff like that, but for me, it doesn’t really mean anything to do with god. It’s just like an otherwise meaningless idiom that people say.