1. It was against his will. 2. He still mentally identifies as male, but pretends to think of himself as female to avoid appearing like a lunatic (who would beleive his story about being sent from another comparatively futuristic world located way out on an east asian island by some mysterious being who calls itself God all as a childish way to rest his lack of faith?) 3. His goal is to beat the game of being x in order to strike down "god" and get his old life back, if anything the guy is aggressively cisgendered.