Evil gods is another D&Dism that’s worth doing away with.
Polytheistic belief systems don’t tend to have evil gods, they might have ones antagonistic to a particular people, antagonistic to other gods, ones who are dangerous but you still need to keep them happy, ones that are easily offended, or ones that have domains that meant you don’t want them to notice you too much.
There are also foreign gods of course but they aren’t evil just a problem if they’re gods of a hostile people.