Lots of people have crises of purpose. It's not unusual, and it's certainly not a crisis of belief.

See, mine is "to fulfill my evil plans". I suggest you start with the idea that you're a supervillain when you're in a crisis of purpose. What kind of master criminal would you be? The reason I don't start with "superhero" is because they're just bascially police officers with interesting talents. It's the criminal masterminds who have vision and purpose. Evil purpose, I'll grant you that, but purpose nonetheless.

So, master criminal, what's the plan?