Is this from the TOTAL population of them, or just the ones identifying as religious?
Outside of the historically black tradition, an additional 15% of African-Americans are members of evangelical denominations, such as the Southern Baptist Convention or Assemblies of God, and 4% are members of mainline denominations, such as the Disciples of Christ. Overall, the membership of historically black Protestant denominations is 92% black, while African-Americans make up relatively small portions of the membership of evangelical (6%) and mainline (2%) churches.But of black Americans themselves, 15% are classed as evangelicals:
- https://www.pewresearch.org/religion/2009/01/30/a-religious-portrait-of-african-americans/