One question for Christians

[Tonus]

God is holy and must punish sin.

The Bible says that:
"the wages of sin is death" (Romans 3:23)

After death, comes judgment before God.

If the wages of sin is death, then why is there a need for judgment after one has paid for their sins? Wouldn't that be double jeopardy?

So the sacrifice of Jesus Christ is to pay for our sins, so those that trust Him as Saviour have all their sins, paid for and forgiven.

Jesus is a substitue to take our place. He pays fro our sins and gives everlasting life to those that believe.

That sounds like cheating. Christ doesn't sacrifice his life, he sacrifices a human body that he wore as a shell for a period of time that isn't even the blink of an eye for him compared to his time spent as a spirit being. Yet this cheap little "sacrifice" is sufficient to save every single soul that sins, if those humans (who stand to lose much more than a temporary throwaway existence) bend their knees to him.

And it's all because god "must" punish sin, apparently by passing judgment on the souls of people who already received their punishment for sin by dying. That doesn't make sense.