God is gay nirvana
It means that the lord and savior Jesus christ, was in fact a raging homosexual. Kurt was both a radical free-thinker and a product of his times. You cannot separate those two concepts. Kurt died before the internet was a household thing, so part of the rockstar lifestyle at the time was to commit flashy "crimes" to get in the news.
At the end of the song, while saying: "Stay away," at one moment Cobain says, "God is gay," which is something he spray painted on a classmate's car in high school as a way of pushing his buttons. Cobain had a gay friend in high school and at one point contemplated his own sexual orientation.