I just like to clarify couple of things, i read half of that article that you pasted, and I think I have the right to defend my religion.
When people hear that the prophet had many wives they conclude without much thought that the prophet was a sensuous man. However, a quick historical review of his marriages, proves otherwise.
When he was twenty-five years old he married for the first time. His wife, Khadijah, was fifteen years older than he. She remained the only wife of the prophet for the next twenty-five years, until she died (may Allah be pleased with her).
Only after her death, did the prophet marry other women. Now, it is obvious that if the prophet was after physical pleasure he did not have to wait until he was more than fifty years old to start marrying more wives. He lived in a society in which it was quite acceptable to have many wives. But the prophet remained devoted to his only wife for twenty-five years. When she died she was sixty-five years old.
His later marriages were for various reasons. Some marriages were with the view to help the women whose husbands had been killed while they were defending their faith. Others were with a view to cement relationships with devoted followers like Abu Bakr, may Allah be pleased with him. Yet others were to build bridges with various tribes who were otherwise at war with the Muslims. When the prophet became their relative through marriage, their hostilities calmed down, and much bloodshed was averted.
JUWAYRIYA BINT AL-HARITH: Her first husband's name was Masafeah Ibn Safuan. Prophet Muhammad (pbuh) wanted Juayreah's tribe (Beni Al Mostalag)to convert to Islam. Juayreah became a prisoner after the Muslims won the Battle of Al Mostalaq. Juayreah's father came to the Prophet and offered a payment for her return. The Prophet asked her father to give her a choice. When she was given a choice she said she accepted Islam and Prophet Muhammad as the last God's Messenger. The Prophet then married her. Her tribe of Beni Almostalag accepted Islam.
"He (Muhammad) used to visit her (Mariyam) there and ordered her to veil herself, [but] he had intercourse with her by virtue of her being his property. (Tabari vol.39, p.194)"
- Maria al-Qibtiyya (may Allah be pleased with her) is said to have married the Prophet (peace and blessings of Allah be upon him) and certainly everyone gave her the same title of respect as the Prophet's wives, 'Umm al Muminin' 'Mother of the Believers'.
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Slaves
It should be very clearly underlined that the slavery once practiced in the Muslim world cannot be compared to the form it had assumed -- for instance -- in the Roman Empire. Islamic legislation subjected slaveowners to a set of precise obligations, first among which was the slave's right to life, for, according to a hadith, 'Whoever kills his slave shall be killed by us'. In consequence, the murder of a slave was punished like that of a free man.
There are many other hadiths which define Islam's true attitude in this regard. The Prophet said: 'Your slaves are your brethren; therefore whoever has a brother who depends upon him must feed and clothe him in the way he feeds and clothes himself; and should not impose upon him tasks which exceed his capacity; should you ask them to do such things, then you are obliged to help them.' The Sharia takes this injunction, among many others, into account when defining the responsibilities and duties of slaveholders.
To avert a similar disaster and to ward off a similar catastrophe, Islam had adopted a progressive and a gradual scheme, fourteen hundred years ago, to do away with the inhuman institution of slavery. Following are some of the measures it took in this regard:
1. In the early Makkan period, it pronounced that slave emancipation was a great deed of piety. The very initial Makkan surahs appealed to the Muslims to liberate as many slaves as they could.
2. The Prophet (sws), unequivocally, directed the Muslims to raise the standard of living of the slaves and bring it equal to their own standard. This, of course, was meant to discourage people from persisting with them.
3. For the atonement of many sins manumission of slaves was divinely ordained.
4. All slave men and women who could support themselves in the society were directed to marry one another, in order to raise their moral and social status.
5. A permanent head in the public treasury was fixed to set free slave men and women.
6. Prostitution, which was largely carried out through slave women, who were mostly forced by their masters do so, was totally prohibited.
7. The affronting names of `abd and amah by which slave men and women were called, were abrogated so that people should stop regarding them as slaves. In their place, the words fata (boy) and fatat (girl) were introduced.
8. Finally, the law of mukatibat provided very easy access for the slaves to the gateway to freedom. Every slave who was capable of supporting himself was allowed by law to free himself, provided that he either gave a certain monetary amount to his master or carried out certain errands for him. After this, he could live as a free man. A special head in the treasury was fixed for this purpose; also, wealthy people were urged to help the slaves in this regard. The net result of this law was that only handicapped and old slaves were left to be provided for by their masters, which not only went in their own favour but also prevented them from becoming an economic burden on the society.
Please understand what the Holy Quran says before you write about it, because most of what you wrote is totally against the teachings in islam which shows they you have no clue what you are wriiting.