It differs because we know that nonsense about Muhammad being a pedophile is historically untrue and is nothing more than gossip spread about da internetz. Well, that would be putting it charably. Actually I think it runs a little closer to bearing false witness, but that's me.
To get back to the OP, hm, what do I know of Islam? Well, I've read the Qu'ran in several translations, have a few collections of hadith as well, have read several scholarly histories written by Muslims and non-Muslims alike, and am always interesting in learning more as I roam about various religious forums or meet Muslims in real life.
I am unlikely to become a Muslim myself, but knowledge is always a good thing.
As long as it's real knowledge and not repackaged rumourmongering.
The evidence that he 'consummated' a marriage with a child comes from Islam itself.
Sahih Bukhari
Volume 5, Book 58, Number 234:
Narrated Aisha:
The Prophet engaged me when I was a girl of six (years). We went to Medina and stayed at the home of Bani-al-Harith bin Khazraj. Then I got ill and my hair fell down. Later on my hair grew (again) and my mother, Um Ruman, came to me while I was playing in a swing with some of my girl friends. She called me, and I went to her, not knowing what she wanted to do to me. She caught me by the hand and made me stand at the door of the house. I was breathless then, and when my breathing became Allright, she took some water and rubbed my face and head with it. Then she took me into the house. There in the house I saw some Ansari women who said, "Best wishes and Allah's Blessing and a good luck." Then she entrusted me to them and they prepared me (for the marriage). Unexpectedly Allah's Apostle came to me in the forenoon and my mother handed me over to him, and at that time I was a girl of nine years of age.
[wash my mouth]
Volume 5, Book 58, Number 236:
Narrated Hisham's father:
Khadija died three years before the Prophet departed to Medina. He stayed there for two years or so and then he married 'Aisha when she was a girl of six years of age, and he consumed that marriage when she was nine years old.
http://www.usc.edu/dept/MSA/fundamentals/hadithsunnah/bukhari/058.sbt.html#005.058.236
[wash my mouth]
Volume 7, Book 62, Number 64:
Narrated 'Aisha:
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).
[wash my mouth]
Volume 7, Book 62, Number 65:
Narrated 'Aisha:
that the Prophet married her when she was six years old and he consummated his marriage when she was nine years old. Hisham said: I have been informed that 'Aisha remained with the Prophet for nine years (i.e. till his death)." what you know of the Quran (by heart)'
[wash my mouth]
Volume 7, Book 62, Number 88:
Narrated 'Ursa:
The Prophet wrote the (marriage contract) with 'Aisha while she was six years old and consummated his marriage with her while she was nine years old and she remained with him for nine years (i.e. till his death).
http://www.usc.edu/dept/MSA/fundamentals/hadithsunnah/bukhari/062.sbt.html#007.062.064
[wash my mouth]
Sahih Muslim
Book 008, Number 3310:
'A'isha (Allah be pleased with her) reported: Allah's Apostle (may peace be upon him) married me when I was six years old, and I was admitted to his house when I was nine years old.
[wash my mouth]
Book 008, Number 3311:
'A'isha (Allah be pleased with her) reported that Allah's Apostle (may peace be upon him) married her when she was seven years old, and he was taken to his house as a bride when she was nine, and her dolls were with her; and when he (the Holy Prophet) died she was eighteen years old.
http://www.usc.edu/dept/MSA/fundamentals/hadithsunnah/muslim/008.smt.html#008.3309
[wash my mouth]
This is confirmed by modern day Moslem web-sites...
"Of the four ahâdîth in Sahîh al-Bukhari, two were narrated from cAishah (7:64 and[wash my mouth] 7:65), one from Abû Hishâm (5:236) and one via 'Ursa (7:88).[wash my mouth][wash my mouth] All three of the ahâdîth in Sahîh Muslim have cAishah as a narrator.[wash my mouth] Additionally, all of the ahâdîth in both books agree that the marriage betrothal contract took place when cAishah was "six years old", but was not consummated until she was "nine years old".[wash my mouth] Additionally, a hadîth with the same text (matn) is reported in Sunan Abû Dâwûd.[wash my mouth] Needless to say, this evidence is - Islamically speaking - overwhelmingly strong and Muslims who deny it do so only by sacrificing their intellectual honesty, pure faith or both.
This evidence having been established, there doesn't seem much room for debate about cAishah's age amongst believing Muslims.
Until someone proves that in the Arabic language "nine years old" means something other than "nine years old", then we should all be firm in our belief that she was "nine years old"[wash my mouth] (as if there's a reason or need to believe otherwise!?!).[wash my mouth] In spite of these facts, there are still some Muslim authors that have somehow (?) managed to push cAishah's age out to as far as "fourteen or fifteen years old" at the time of her marriage to the Prophet(P).[wash my mouth] It should come as no surprise, however, that none of them ever offer any proof, evidence or references for their opinions.[wash my mouth] This can be said with the utmost confidence, since certainly none of them can produce sources more authentic than the hadîth collections of Imâms al-Bukhârî and Muslim![wash my mouth] Based on the research that I've done, I feel that there is a common source for those who claim that cAishah's age was "fourteen or fifteen years old" at the time of the marriage.[wash my mouth] This source is The Biographies of Prominent Muslims which is published in book form, on CD-ROM and is posted in several places on the Internet.[wash my mouth] Just another example of why going to the sources is important . . ."
http://www.islamic-awareness.org/Polemics/aishah.html
(We concur with the general contents of the article.
and Allah Ta'ala Knows Best Mufti Ebrahim Desai
http://www.islam.tc/ask-imam/view.php?q=6618)