Grace and Peace to all,
Iam new to this site, but I am a moderator on an "ex-muslim" web site. I am not a muslim, nor ever have been. My personal feelings on the matter of whether we worship the same God is no. The reason is that their early Scriptures tell us that Muhammad agreed with Jews and Christians, but later when they denied his prophethood, the Qu'ran changed to a hostile view of them.
One has to ask would satan the master deceiver use the name satan? Or would he claim to be God? Those of us who are Christian know the power of Jesus death & resurrection, over satan. He needed to try to lead as many as possible away from that, and try to discredit it as well. Also to discredit the old Jewish Scriptures, which is exactly what Islam attemts to do.
Here's an interesting statements from a book entitled: Answering Islam by, Norman Geisler & Abdul Saleeb,
EVALUATION OF MUSLIM CLAIM FOR MUHAMMAD'S DIVINE CALL
For many critics of Islam the Muslim view of Muhammad sufferes from an acute case of overclaim. They do not find, for example, support for the claim that he was called to bring final revelation from God in the circumstances that surround Muhammad's call.
They point out that during his call he was choked by the angel. (Compare that with Daniels revelation) Muhammad himself said of the angel, "He choked me with the cloth until I believed that I should die.
Then he released me and said: 'Recite!' (Iqra)." When he hesitated, he received twice again the repeated harsh treatment." This seems to many an unusual form of coersion, unlike a gracious and merciful God Muslims claim Allah to be, as well as contrary to the free choice they claim he has granted his creatures.
Muhammad himself questioned the divine origin of the experience. At first he thought he was being deceived by a jinn or evil spirit. In fact, Muhammad was at first deathly afraid of the source of his new found revelation, but he was encouraged by his wife Khadija (whom was 15 yrs. his senior) and her cousin Waraqah to believe that the revelation was the same as that of Moses, and that he too, would be a prophet of his nation.
One of the most widely respected Muslim biographers, M.H. Haykal, speaks vivdly of Muhammad's plaguing fear that he was demon possessed:
Stricken with panic, Muhammad arose and asked himself, "What did I see? Did possession of the devil which I feared all along come to pass? Muhammad looked to his right and left and saw nothing. For awhile he stood there trembling with fear and stricken with awe. He feared the cave might be haunted and that he might run away still unable to explain what he saw.
I find that most interesting, based on the anger and hatred he had for Jews and Christians later on. I think that God will give powerful signs to all his people so there will be no mistaking his truth.
In Christ
ILJ