Plenty of cultures throughout history have conceived of gods that weren't particularly good. The gods of Mesopotamia were assholes by the standards of their own culture, not just ours; a hero was someone who could stand up to them.

If people who don't even believe in the religion have come to conceive of divinity in such a way that it "doesn't count" if the entity doesn't satisfy the whole omnipotent/omnibenevolent package, it's a sign of just how much modern monotheism has dominated the memetic landscape.

I managed to pass much of my childhood as a real outsider to religion, not just lacking belief, but having almost no awareness of what most people believed. My first exposure to religion and mythology was polytheistic, and I didn't recognize the distinction between "living" and "dead" religion (at the time, I thought they were all fringe beliefs preserved by minorities,) so I still recall the confusion I felt when I started to find that most people saw polytheism as fundamentally different and less plausible.