Create ideas of white supremacy? I would stay out of the ideology on this case.
However, according to most Arab records, such as Ibn Battuta, the majority of people of the so called Islamic kingdoms were not Muslim. He remarks widely of their lack of basic Islamic topics and sophistication and how they practiced slavery. The reason for this, is perhaps the same as the reasoning in India; that being, African Muslim states refused to actively distribute Islam unto pagan subjects as this removed a population eligible for slavery.
African Muhjahid states changed this. Just like in Indonesia, it is the physical strike and surge that brings the knowledge of Allah. Sufi mystics, and other Dawi only distribute basics, society is always changed by power and the state, never by innocent religion.