Black Hebrew Israelites are not associated with the mainstream Jewish community, and they do not meet the standards that are used to identify people as Jewish by the Jewish community. They are also outside the fold of mainstream Christianity, which considers Black Hebrew Israelism to be heresy. Black Hebrew Israelism is a non-homogenous movement with a number of groups that have varying beliefs and practices. Various sects of Black Hebrew Israelism have been criticized by academics for their promotion of historical revisionism.