Organized large scale religion was invented as a way to calm and control the masses. You're not going to challenge the pharaoh if he is a god, you're not going to question the emperor if it results in the worst possible afterlife, and you're not going to question moral and ethical wrong doings if the pope says not to.
Religion may have started as the simplest answer to phenomenon that was unexplainable, but we have moved on from that. Early jews (the old testament) thought the sky was a dome that god filled with water. Why? It was blue, and water fell out of it sometimes. We know better than that.
But now it has progressed pass that as a social and political tool. If people could practice religion in peace without forcing onto others, i would be happy. But instead people preach a logically retarded set of ideas, and even try to get the government to continue pushing their outdated philosophies (gay marriage, used to be slavery, interracial marriage, women's rights as a whole) onto everyone, even those who don't follow their religion.
The Middle East and Africa are worse about this than the US, but we still love to push christian ideals onto non-christians.