One of the major schisms in the Church of the SubGenius is between the Ivangelicals and Holocaustals. Ivangelicals believe that the remaining humans should simply be enslaved after X-Day, with SubGenii rightfully ruling over them. The Holocaustals believe all humans should be slaughtered during the Rupture.
As the name implies, the Ivangelicals are led by Rev. Ivan Stang.