I find that it has its usefulness, but I'm not certain it outweighs any negatives that may come with it. It can often bring people together for good like not many other things seem to manage to do. The unfortunate side-effect is that it also sometimes brings them together for bad.
I'm not so certain that this is true. It may be making things more difficult to overcome, but I would not say it's the cause. The cause comes before religion. Ask yourself, why would marriage even be considered to be between a man and a woman within a religion in the first place? In my opinion, the answer is quite simple; it's because the majority of people find the alternative gross and unnatural. But mostly gross.
Regarding religion and race, I believe that if there was no religion to channel any racism, racism would still spread. Whether you hate people because of religion or because of race, it doesn't really matter. You'll find a reason to hate them, because they're different. People hate groups of people because of the type of government or economy they have. Stupid reasons to hate a group of people, to be certain, but it's a reason nonetheless. People will attack anything that doesn't fit in with what they're used to.
Here again, morality came before religion. Many teachings of the Bible are basically laws themselves. Laws are based on the concept of morality, which is one of the bases of religion. Our current laws and the laws of the Bible just happen to coincide because it is generally agreed that those are moral things to follow. Take out religion and I believe we'd still be following the same laws.
Overall I think that, although religion may facilitate certain bad things, people would find other ways to do it anyway. Just the same, maybe they'd find other ways to do good. Religion is just the vessel. Without it, we'd find another one, or make one if we have to.
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