While devoted activists from both sides of the gay marriage debate plot strategy for their next moves, Michael Glatze mostly watches from the sidelines. That's surprising to some: Just four years ago, Glatze was a practicing homosexual, a prominent gay activist, and editor of a national magazine for gay youth. Two years ago, he publicly renounced homosexuality and asserted a belief in Christianity. Glatze soon disappeared from the public eye, resisting a well-worn path: instant hero status for a new cause. In October, he re-emerged, granting a few interviews and writing a column for the conservative site WorldNetDaily about remaining...