1. Witnesses are disproportionately Black. How do I know?
Well, Firpo Carr quotes Werner Cohn on page 41 of his book "Jehovah's Witnesses: The African American Enigma - A Contemporary Study, Vol. 1", as stating that in the US "membership of the organization was approximately 50% negro." Yet Cohn has been undermined in a number of respects in his scholarship on the Witnesses (See James Backford "Trumpet of Prophecy"), and his figures appear to be merely estimates based on his own observation. However more credible evidence for the disproportionate number of Black members can be found in the most recent edition of James Penton's book "Apocalypse Delayed", page 388, n. 90 where he states that a recent Convention discourse revealed that Blacks account for 18% of the membership in the US, compared with 12% of Blacks in the general population. That represents a significant over-representation of Blacks in the Witness community.
2. Apostates are disproportionately white. Evidence?
Showing that apostates are predominantly white is more tricky. Raw figures on the relative race percentiles of defectors would be impossible to gather due to the nebulous nature of the 'apostate movement', to the extent that such can even be styled. Nevertheless, it is an easier task to perform a search for Black's represented among apostate leaders who have published anti-Witness tracts: Raymond Franz, James Penton, Jerry Bergman, Randal Watters, Edmond Gruss... they are all white. I struggle to think of any apostate leaders who are black. Since nearly 20% of Witnesses are Black, we would expect at least some Blacks represented among prominent ex-Witnesses. Can anyone thing of any?
Interestingly, the Witness apologetics scene is contrastingly small compared with that of published apostates, yet among their depleted ranks there are at least two influential Black proponents: Edgar Foster and Firpo Carr himself. In the absense of firm data for apostates, I submit that their virtual absense from the high-profile apostate scene is at least an indication that Blacks are under-represented in the apostate ranks compared with among Jehovah's Witnesses.
Thanks for hearing me out...