Because how do you know our definition of evil is actually correct or valid in any external context not involving humans? Why would a god consider death or pain or suffering evil?

A child could call you evil for not giving it all the candy that’s in the box. For restricting its playtime. Why couldn’t we be the same with death and pain and so on compared to a god?

Of course that doesn’t apply to the Christian god that tells what is good or evil and shit.