Midway through “Dogma,” Kevin Smith’s unlikely stew of millennial theology and turn-of-the-century pop culture, Loki, the voluble, sociopathic angel of death played by Matt Damon, muses on his shortcomings as a prophet of mass taste. Specifically, he still can’t believe that “E.T.” was the Hollywood blockbuster of the 1980’s, instead of “Krush Groove,” Michael Schultz’s rags-to-riches showbiz parable featuring the rap group Run-D.M.C.