Because the Patriarchal religions are specifically misogynist and sought to eradicate the public legitimacy of the feminine. Muhammed set out on his reform of the biblical religions becuase christianity had failed to comprehensively abolish pagan goddess-worship in the form of the virgin mary. I would suggest that this pattern has duplicates in many other cultures in which an early female originator goddess is supplanted or superceded by a male patriarchal god.