Christians and some other people don't believe
that Mohammed was actually a prophet for the following reasons.
1) Prophet Mohammed Massacred the Jewish tribe 'Banu Quraiza'. There is also a Hadith in refence to that incident.( Sunan Abu-Dawud Book 38, Number 4390. He killed all the men and enslaved the women and children. This is also mentioned in the Sahih Bukhari, Volume 4, Book 52,Number 176 and Number 280 to Number 288. The Sahih al Bukhari is considered to be the most authentic hadith. He also massacred the 'Banu Nazir' tribe.
2) A true prophet cannot marry a nine year old.What is more disappointing is the Holy Quran advises Prophet Mohammed to marry a nine year old. It is a form of perversion, some people think God cannot advise a 53 year old Prophet to marry a nine year old. Can you give examples of other Arabs from history who married 9 year old?
Sahih Bukhari the most authenic hadith confirms that Mohammed married Ayesha at the age of 9
Sahih Bukhari Volume 7, Book 62, Number 64
that the Prophet married her when she was six years old and he consummated his marriage when she was nine years old, and then she remained with him for nine years (i.e., till his death).
3) Also the glorious prophet married his adopted son's (zaid) wife. Again Allah in the Quran advises Prophet Mo to marry his adopted son's wife Zainab.
The Holy Quran in Chapter 33 ( Sura Al Azhab) Verse # 37 says
"Zaid had accomplished his desire from her (i.e. divorced her), We gave her to you in marriage, so that (in future) there may be no difficulty to the believers .