" I implore you all, don't bet on the dark one, it is a bet that you will never win."
Something to consider before pledging allegiance to Satan would be why Satan is where he is. Satan was an angel appalled at the thought of serving humans. Why serve those stupid monkeys, he thought, when I am a vastly superior being? God says, uh-uh, and boom! Satan is banished to hell because he refused to serve people.
Considering his exile, do you really believe that Satan would welcome those worthless excuses for creatures, the very reason he resides in the the flaming pits of hell, with open arms? He may not be able to directly strike back against God, but indirectly by torturing the stupid monkeys that God holds so dear.
Getting the insignificant creatures to worship him instead of God during their lives is just an additional slap in the face of God before the real fun begins after they die.