In the Koran, Muhammad is advising some who want to join the war against the pagans to stay by their mothers and go on in taking care of them, assuring them that it is as worthy in God's eyes as fighting for Him in a battle.
By the time Muhammad had his first revelations, Islam came as a tool of God imposing social justice in a world that was divided between tribal wars where women were simple objects in theirs husbands' and fathers' hands. Social justice is also including a fair attitude toward them and it is acting like a book that guarantees their fundamental rights for the first time in the Arabic world, long before they got any rights in the Western world.
It is true that polygamy was allowed by the Koran, but one has to envision it in the frame of a world divided by tribal fights...
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