Whats the difference between catholic and moslim?

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I have wondered what the big difference is. Do they believe in different gods? or the same god? Is it just a matter of a different book referring to the same story? I am not trying to be rude. I just don't understand why there is so much anger betweent the two religions. Surely both say that one must treat others as you would be treated. Surely they both suggest that it is right to respect other people and care for them. Surely both religions advocate peace. If they advocate violence, then what is the use of them?