Hey, it's not dumb to not know things!! It's only dumb to not learn things when given the chance. You don't have to apologise for not knowing something, especially given your question wasn't dumb. In fact it's exactly right; I'd argue that most societies operated under what they did not consider was a religion and has later been understood in a Western anthropological context as a "religion." I fact, having a religion that consists of a holy book, laws, belief, prophets, etc is the weird outlier, as for the overwhelming plurality of human history nobody had that.