Who knows. He created his goth/punk/metalhead persona but then his own character (himself) starts singing christian songs... and Rod Stewart songs lol
I don't think he takes his edgy side seriously. Not in a ironic way, I mean more like he doesn't know shit about gothic, punk or heavy metal music. Why would he sing a love song by Rod Stewart instead of one by Type O Negative or Lacrimosa?
I bet his parents listen to Rod Steward, hence the influence.
For consistency. His character looks like Gene Simmons with Pinhead makeup and Leatherface's hair, dresses in black, has a "tough guy" attitude, serial killers as friends... and then he switches to love songs, christian preaching and stuff. Even when his own castle has a pentagram-shaped platform, it doesn't count as satanic imaginery? His autism is too advanced.