First, if I were to be the big guy in the sky, I'd show everyone my face!
That way, everyone will change what I tell them to change, whether it's planned or if it's on a whim!
There will be only one world religion, and I'm going to be writing the rules on that one! Burn all your Bibles and Korans or whatever Holy Books you previously followed; all theocratic governments will have to disintegrate in seven days or prepare to face the consequences!