<p>"Islam reached sub-Saharan Africa in the earliest days of the religion and spread slowly over the following centuries. Although occasionally brought by the sword, expansion was largely a peaceful affair facilitated by trade routes linking the region to the Arab world. The process can generally be understood as one of gradual diffusion, which had the effect of overlaying Islam on rather than wholly eliminating local belief systems. As a result, the Islam that developed in Africa was characterized by diverse practices, and rigid understandings of the Quran and the Sunnah were eschewed in favor of less doctrinal observances that focused on the believers personal relationship with Allah evidenced by the widespread popularity of the tariqa (Sufi brotherhoods)."</p>
<p>Let's see... Islam started around 600 CE, so let's say it go to SS Africa in 700 CE. When it came, people got it but did not prefer it over local religion.</p>
<p>SO WHAT'S THE ANSWER?!?!?</p>