[danjc]

Hard to know how to respond succinctly here. With respect to our sin deserving eternal judgment consider the majesty of the person being sinned against. For example if I stab my friend in the back to get ahead in business I might face litigation worst case. However if I attempt to overthrow the government I'll be charged with treason and might even face execution depending on where I live. Both scenarios are forms of disloyalty but society understands that the severity of the punishment should be according to the "majesty" of the person wronged.

With regards your second last paragraph, I'd recommend reading Romans, particularly chapter 8. You are right that those who believe in Jesus get off "scot free" but this is only because atonement is substitutionary. A Christian's sin is imputed to Jesus while Jesus' righteousness is imputed to him/her.

[fwip]

I feel like stabbing is usually a criminal act.

[phyller]

I think he meant figuratively, like he took credit for his work or something. Not an actual stabbing with a knife.