Certainly, some religions could be considered the same, and many have characteristics that are strikingly similar to other religions (the ten commandments and their meaning are expressed in some form or another in most religions. Howevever, some condradict each other directly- take Islam and Christianity for example. Islam claims Jesus was not the son of god, and therefore could not have saved humanity from their own sins. This death on the cross is the essence of Christianity and forms the cornerstone of any Christian's faith. Also, neither the bible nor the torah mention anything about mohammed, while this prophet is essential to the faith of any muslim.
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