The reason why people with differing beliefs tend to clash is this: a belief is not Knowing. Belief is intellectual and is the creation of your own ego regardless of how you arrived at it. Nothing will defend itself to the death like the ego-mind, so it will raise up in defense of itself. Examine a belief and accept the truth it brings you to, then release it. The truth alone will remain and has no need to be defended. It stands alone without effort.