“We have just enough religion to make us hate, but not enough to make us love one another.”
Jonathan Swift
Religion teaches us to think others deserve our hatred, so any "love" would be pity.
Religion has separated man into different groups/factions. If only people weren't so bored back then, that they had to make stories up and force people to believe it. This is what they did in their spare time, they made up stories and then believed them to be true. People are so gulible.