I would destroy religeon, but don't get me wrong, I'm not an atheist, Im a Roman Catholic, but as I learn more and more history, I learn how many wars, and lives have been lost due to religeon, how much religeon has slowed down technological progression in the past, and how it promotes social barriers between people that make peace harder and harder to achieve, so yeah...
Anyway, the government thing was my second choice, but you could do that much easier with control over the media, rather than summoning a demonic legion,which will probably then start rampaging through major cities and kill the people that support you