Why Differ on the Source of Principles and Values?

Christians often imply that only Christians can have principles and values, and that a "relationship with God" is essential for overcoming "original and enduring" evil. As long as this attitude prevails, that Christians are right and everyone else is wrong, how can there ever be peace and harmony? How is this any different than the Muslim belief of the same ilk? Must we all become either 100% Christian or 100% Muslim in order to get along?
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