World Religions

I was talking with a guy the other day about how Christianity is exclusive from other religions. He kept trying to argue with me that "No, we all worship the same God."
He was stumped when I asked the question, "Why then would God contradict himself so many times then?"

Because really, we need to ask this question if we believe what we're saying is that all religions lead to the same place. Because the Bible speaks very differently from that of Buddism, Islam, or even Mormonism.

When scripture describes where we'll be, the Bible says that we'll be on the new earth, which is co-mingled with Heaven, that God will be our light, there will be no sun, nothing. That we will eternally worship him, and he will be our sole focus. We won't be married, we will receive new bodies, and that when we die, we go to be with Christ. Islam states something drastically different... basically, you get to have self-worship when you get to heaven... you have a paradise, with virgins, etc (if you're a man)... and the women are basically left out.

Even our creation stories are different.. again, let's compare islam to Christianity... Islam states that Adam repented after he sinned and ate the fruit, therefore the world is still good, it's not corrupt, etc. Where as the Bible states that Adam didn't repent, that he blamed the woman, and thus the fall of man ensued, and sin entered the world and creation is corrupt. Which, therefore, two completely different world views are taken. Completely different! As in, NO SIMILARITY!

The Bible says that Jesus is the Father (aka God), and that Jesus is the only way to the father (Jesus is the only way to Himself), and that He is the Way, Truth, and Life. Islam teaches Jesus was a dude, with some good thoughts, who even maybe had some revelation from God, and was born of a virgin, etc.
Again, two very different views.

Christianity teaches that you can't do jack-all to get to heaven. That, in fact, God opposes those who think they can get thier way to heaven. The bible speaks strongly on the doctrine of Justification... which is where it's like you're in math class, and the teacher tells you to Justify your answer... religion is you showing your work, and getting the grade accordingly. In Christianity, it's the opposite. Jesus did the work for you, so you just get to go to the back of the book and write the answer down. You see the question, you get the answer, done. No work.
Islam, Buddah, Hinduism, mornmonism, JW's, they all teach the same thing... you must work, you must DO things in order to get to heaven. Christianity is exlusive in this. You cannot save yourself. You cannot be saved apart from the divine grace of God, and him saving you. God saves you, you don't accept him. You just come to the realization that he's chasing after you, and wants you in his family (which, yes, is everyone, but there's a difference between a redeeming God, and an "accepting God).
Our God redeems. Religion accepts based on works.
According to Christianity, if we got what we really deserved, if it was based on works, hell is our only option. That place of isolated suffering.

WHO IN THEIR RIGHT MIND WOULD EVER SUGGEST THAT THESE ARE EVEN REMOTELY THE SAME?

Now, I'm not arguing here that Christianity is right, but that it is exclusive.

So in summary, why would God contradict himself? Why would world views be the drastically different? Why would action/non-action play a part in salvation?
No, the simple answer is, they do not point to the same God/gods. They point to something completely different.