Spiritual

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How do you convince a layman that the Trinity is one God?
How sinful is not believing in religion?
I want to repent so I don't go to hell, but I don't actually want to repent. I've tried reading the Bible, it doesn't change me. What should I do?
Buddha said: "Vigilant is the path of immortality. Inattentive is the path of death. The vigilant never die. Those who don't are already like dead people." Isn't it the same thing Christ said when he said, "Let the dead bury the dead"?
What are some details about enlightenment, as your faith and belief systems explain?