Simply put, you follow a different Allah than us.
The True God would NEVER give his final revelation to a pagan ishmaelite, especially someone like Muihammed in his situation. Look at how many wars and death happened at the hand of Muhammed. Is this what God desired to have happen? The TRUE GOD fulfilled His covenant with the Jews by sending the Messiah, the one the Prophets spoke of, and He created a new covenant for all of mankind. The final and greatest revelation is the Gospels. The Quran is NOTHING to even compare to the Gospels. Your perception of god is inferior and backwards.