The black church is not an anomaly among folks who follow Christ. They are among the same family or 'body of believers' as Protestants, Evangelicals and Catholics; the black church just doesn't "obsess" over an 'official' classification as some do. Technically, its Protestant and/or Evangelical.
The black church's operating tenets are "anti-homosexuality" because scripture is "anti-homosexuality"; just like its anti murder, stealing, adultery, fornication, etc. . . If they didn't observe "faith tenets", then there is no longer a need to call itself a "church" or "Christian" for that matter.