God is real, I have a book saying so! 🤣

But on a serious note, and using plain and simple logic, if any god existed there would not have been any doubt, or even more than one religion. Period.

Also, why would Satan do his arch enemy's dirty work by punishing the latter's sinners? It's bullshit, a hole as big as a garage door in that fable. Satan would much rather train new arriving souls as soldiers in his fight against God, and believe me, they'll be pissed-off enough with God to sign right up.