White islam has been genociding blacks for centuries.
True. Although white Christians stopped doing so less than two centuries ago.
However, these actions in today's world are performed by local tribes for generally non-religious reasons.
The Somali Islamists who recently got clobbered by the Ethiopians are quite black in color, for instance. (So are the Ethiopians.)
It is just a fact that Islam is a non-racist religion, although as with any other religion not all its followers always implement these ideals.
Islam has many aspects that are entirely accurate to criticize. Why haul in an inaccurate one, which is easily disproved, thus weakening the case?