You’re presupposing there ought to be a reason not to believe. And no, it’s not a question of semantics. I don’t need a reason not to believe there are magical creatures who come out at night to make the grass longer in my garden. I would need a reason to believe that, and there isn’t one.
Early humans invented various kinds of supernatural beings and forces to explain things they had no other explanation for. That is what gods are - a human invention. At first there were many, much, much, later in human history the formation of empires led to the creation of fictional mega-gods, one up from the intermediary city gods, which eventually morphed into the idea of one, all-powerful, omnipresent god. That god is a recent human invention. You can quite easily track that process of human creation of gods through ancient literature. Even within the Bible, god changes and develops.
Science is useful for explaining a lot about how the universe works, and for finding a lot of practical life solutions. Maybe there are things beyond science? Who knows? But there is zero reason to think that whatever they are they would correspond with our imaginary ideas about gods. There’s no more reason to think there is some human-like god being out there than to think there is a real version of a talking cartoon train somewhere, like Thomas the tank engine, or a real Don Quijote charging at windmills. They are all fictional characters, created by people who write books.