In the bible there are literally hundreds of prophecies, all made in Gods name. There are over 300 foretelling the coming of Jesus --in detail.
Yet in the Qur'an there is but one prophecy and this is in Sura 30:1-4. In this gem of a Sura we are told that the Roman empire has been defeated but that, "in a land close by" the Romans will be victorious again "in a few years".
Think about this for a minute! The "prophet" Muhammad gave no signs, performed not one miracle and made but one, vague, prophecy that sometime in the next few years the 7th century Romans who were still quite strong militarily would have a victory. Earth shaking stuff, huh?
Muhammad himself admitted he could do no miracles. In fact nowhere in the Qur'an does Muhammad perform even one miracle. So for Muslims to claim he performed miracles when the Qur'an itself states he did not is simply lies.
Sura 17:90-93 of the Qur'an tells about how, when Muhammad was challenged to perform a miracle and prove he was from the true god, he could not perform any and here he actually says himself:
"Am I anything except a human messenger?".
In Sura 13:7, we find that Muhammad did not perform any miracles. The people are saying that even one sign would be enough to convince them, just one miracle performed by Muhammad - and yet he still does none....
The New Testament repeatedly declares that Jesus Christ is the Son of God (Yahweh), that He was crucified and resurrected to both pay for our sins and to make possible our salvation, but the Qur'an expressly denies all these things. The Qur'an says Jesus was not crucified. (Surah 4:157-158). The Qur'an teaches that those who believe in the Blessed Trinity are dung. If you accept Islam, you forever reject Jesus. It is a decision that will effect where you spend eternity.
So, because a single lying, murderer, rapist, plunderer and thief (Muhammad) who did everything for his personal gain --walked on this earth - billions of souls (Muslims) are forever lost to you Yahweh. Why was it allowed?
Read:
http://bibleprobe.com/muhammed.htm