Interesting that at first Muhammad didn't even know that his "visions" were from God.
t seems that the belief in Islam takes a blind leap of faith. Meaning, so much weight is given to the question of whether God truly spoke to Muhammad. A man who wasn't sure he heard from God after supposedly hearing from an angel, had suicidal thoughts, built a following partly based on military conquest, married/had sex with a nine year old, and advocated the murder of his enemies. I mean comeon, you have to agree that some of Muhammad characteristic's are unfit to be a prophet of God.
In case you are interested, these things can be found in Revered Muslim writings such as "Sirat Rasul Allah", the Hadith collections of Bukhari, Muslim, and Abu Dawud, and "The history of al-Tabari" among others.
And another point about Islam. I'm sure some of you might disagree but I think this is an incredibly important concept. First, I will ask anyone what is mankinds deepest desire? (in general) Well, when I look at myself and all of the people around me, it is obvious to me that everyone wants to be loved. I believe saying that "being loved" is mankinds deepest desire. Interestingly enough though, this is the one thing that is never 100% satisfied. Yes, you can have the best family in the world, marry the most unbelieveable woman, but there is still something lacking - there are times when you can't fulfill this desire no matter what. On the contrary, if you have a sexual desire then you can have sex. If you are hungry then you can eat until you are completely full.
The point I am trying to make is this: The Quran describes Allah as an impersonal being, impossible to approach or fully comprehend. Essentially meaning, mankind cannot have a personal relationship with Allah - instead Allah can only be worshipped from afar in paradise. So the one thing that mankind wants the most and the one thing that cannot be 100% satisfied on earth, Allah does not fulfill. Instead it is almost the opposite as Allah is s far above mankind that he is virtually unknowable. I'm sure many Muslims will find a way to disagree with me on this but seriously, when I was looking for the "truth" or however you want to call it, this was one of the aspects of Islam that seemed wrong.