Do we all believe the same thing?
And what you don't have in Buddhism and Islam, Confucianism, Shintoism, Taoism, and these other religions is an atonement. You don't have a way of redemption that we have in Christianity, nor do you have a living Mediator. Moses is dead, Buddha is dead, Confucius is dead, and Muhammad is dead. There is no resurrection in these other religions.
Christianity has elements to it, content to it that distinguish it from all other religions, and with that distinction comes the claim of Christ that it [He] is the only true way to God.