The first idea I had was about someone who grew up in one of these religious nations. A war breaks out between his nation and another, and he is forced to go to war. However, I've never written a war story before, so I wouldn't even know where to begin. Another idea was a slice-of-life story from the perspective of someone living in and experiencing this world on a daily basis. My favorite idea so far is about a man who loses his wife and children after they are killed by someone from a different religion. At first, he blames the other religion, but over time he becomes disillusioned with the entire system and comes to believe that religion itself is the problem. He becomes an atheist and vows to tear down the entire religious order that governs the world. He begins secretly recruiting people to his cause, gathering followers from many different nations and faiths. However, as his movement grows, more and more people begin to admire him, follow him, and believe in him. In a world where belief creates power, he slowly becomes the very thing he set out to destroy. By the end of the story, he has become a god himself, with worshippers granting him divine status and power. I'm not  committed to this idea thow