Sweetie, I hate to break it to you but that exact platform and it's infrastructure has worked for the Christians for 2000+ years
Sorry, just a fact. Fear is a spectacular motivator when you don't actually want to spread the wealth and give up your power yet wish to maintain ironclad control over the masses.
Long story short, you don't mess with success. Organized religion has way more experience than democratic politics when it comes to maintaining power by scaring people into what you want them to believe.
Oh, and a homogenous America?! Let's get real here, any hope of that evaporated the day Europeans landed here and decided the best road to their success lay in the extinction of the continental native population coupled with the importation and enslavement of people from another land.