Wouldn’t that make you an agnostic?
Not OP, but I adopt “atheist” more than “agnostic” because in addition to not assuming there to be a God, I also find the question “is there a God?” to be a bit of a meaningless question since God is undefined, nebulous, and untestable. If I entertained the question and found it worthy of engagement, I’d think of myself being “agnostic” instead.
Objectively, I can’t know if a god exists somewhere and I just haven’t seen it. Proving a negative, all that.
But I don’t believe such a being exists, and while I’m okay with the lack of certainty… there is a chance I might be wrong.
But even if the Christian god existed… he’s a total asshole.