"Religious" means it's a concept people believe in because it's a contagious brain parasite, not because they have a reason to think it's correct.
In this particular context, I disagree with your assessment. Or maybe your framing.
You seem to be assuming that because something is captured by religion, it must therefore be wrong and false. I don't think that the case with all of religion. I grant it as true for whether or not an actual conscious deity exists, but there's a whole lot more to religion that just whether or not god is real.
There's a reason that the core concepts of morality tend to be very similar across all religions - it's because they're largely the result of evolution influencing social behavior. Dogs and cats have an innate sense of property ownership, monkeys have a sense of fairness.
Dogs and cats have favorite toys or beds, that they don't allow just anyone else to use. They might choose to share them with others, but for all intents they view them as theirs. My cats had some kind of a discussion as kittens, and ended up with one claiming the head of the bed, one claiming the foot of the bed, and the other somehow being exiled to another room at night (she must have smelled bad, I don't know how they came to this conclusion). If foot-cat ventured to the head of the bed, there was a conflict. We've got friends with multiple dogs, and each has a toy and a bow that is only theirs - the others don't get to use them. If one of the other dogs grabs the "owned" toy, it's going to be an argument until the toy is dropped.
It may not always take the exact same form, but I'm inclined to think that all social animals have some innate sense of justice, appropriate behavior, etc. Religion, in most cases, just cofifies that innate sense.
TLDR: God might be a "contagious brain parasite", but a lot of the fundamental concepts of religion are not.