I originally started my current world by being mildly frustrated with the gods available. I didn't want historic pantheons and the gods for the base game and published setting were just... too... sensible. All of their portfolio was too logical for me. I liked the gods of historical myth that had portfolios of things that didn't go together logically and only made sense because of the legends around them. So I came up with a needlessly complex way to generate gods, then I gave them a backstory, then I gave them the world to be godly to.