Religious Portrait of African Americans - While the U.S. is generally considered a highly religious nation, African-Americans are markedly more religious on a variety of measures than the U.S. population as a whole, including level of affiliation with a religion, attendance at religious services, frequency of prayer and religion's importance in life. Compared with other racial and ethnic groups, African-Americans are among the most likely to report a formal religious affiliation, with fully 87% of African-Americans describing themselves as belonging to one religious group or another, according to the U.S.