Did you join this forums to ask genuine questions, or to try and prove Christianity/ faith wrong? If the first, you are very welcome here, if you are here to prove us wrong, you might be in for a surprise.
The difference? God IS real, and no matter how "good" or "bad" you are, rejecting the free gift of Jesus Christ means that on the final day you are separated from God. Up until then, I think it would be just the same. People fight over anything, not just religion.