God didn't make the world so it can be perfect- or else we would all be robots. We all have our ups and downs for a reason. If bad things didn't happen to us, then we couldn't fully appreciate the bad things in life. Then we would just be living a world of boring monotony. What kind of life would that be living? That's not a life! The world is colorful and that's what makes us all so fun to be around. If God made life perfect, then what would be the point of life?

Nathaniel Hawthorne had a Puritan upbringing but unconverted because he did not like some aspects that his ex-religion had developed into. However, you can see themes of the effects of reaching enlightenment or perfection in several of his works. Basically what his message is saying is that once we achieve this level of perfection, there is no need for us to be living anymore. In this sense, God has put thought into carefully making such an array of beings- the vast amount of things and stuff he has created.

God represents a way to live life. If there was no God then there would be no reason for people to not do whatever they want. Yes there would be rules and such in the framework of our government. But internally speaking, there would be no need to follow such rules. A world without God is no world indeed.

As for the problems for segregation, well you're just basing it off of certain individuals who chose for themselves to pervert the foundational value of their "religion", those who use religion as an excuse. They don't represent the whole of religion. It's more about the interpersonal relationship with God and oneself.

As for the Hitler comment, well he was just a corrupted individual. I'm pretty sure there are corrupted atheists too like Mao Ze Dong, Joseph Stalin, and Benito Mussolini. Religion doesn't define a person, it's ones individual morals that define him/her self. No individual person is a representation of their whole entire faith, that's just silly and absurd.

Actually the foundational theme in just about all religion is to love each other. In one sense, religion can just be another way for living out their moral code. Just how you carry it out is a different matter.