I doubt that the devil exists. To give the devil so much credence undermines Gods power!
The thing about God being all-powerful is that He gets held responsible for the bad things that happen as well.
And that’s fine. Blame God for all of the bad things that happen. He can handle the blame but just don’t act like the other energy -the devil energy- is equal to Gods power because it’s really not.
What God is up against is human nature, honestly.