Plausible deniability and more lawyers than God helps.
God probably doesn't have a lot of lawyers, but Amazon has more lawyers than Satan, too.
Doesn’t Satan really mean like cross examiner or something
According to https://en.wikipedia.org/wiki/Satan, it means "Accuser" and "Adversary". Apparently (according to my foggy memories of a video essay about some high-art film) Satan was originally just the dude that would accuse you of all your sins you committed while mortal.
Let me guess, he got concerned about job security when all those monotheistic religions and their high horse morals developed and so he decided to actively prop up the supply side?
In essence Satan is the prosecuting attorney, Welcome to America!
The accuser.
One of the names of Christ is "the Advocate" so perhaps God just has one really good lawyer, and Satan has the rest.