While rejected by the most orthodox branches of Judaism to the point that some Jewish branches do not consider them to be legitimate Jews, the Autenticos have become the fastest-growing branch of Judaism by the 20th Century PD. They rejected the notion of a hereditary "chosen people" enshrined by their more orthodox and traditional brethren and considered that it was a self-selected body. Thus, Autentico Judaism practiced proselitism and conversion among non-Jews.
Autentico Judaism found popularity among freed genetic slaves, partly because several Autentico practitioners were willing to fall into slavery to proselytize their fellow slaves; this led to the official banning of the religion on Mesa. Also, several Autentico-related troubles were experienced on the Mfecane worlds.