[unaindz]

I would argue that theism is not just a simpler explanation but a more naive one.

We could also explain computers as magic and it would be simpler than explaining it with electricity and math.

No religions are based in any observable facts* and thus being naive explanations, indistinguishable from magic.

* More like they are based on deprecated observable facts, at first the sun and nature, later man and it's dramas. Now we now the sun is just a big ball of gas and man is just a big brained mammal.

That being said religion is just one area of many and you could be very rational in lots of them but be religious for whatever reason.