Christians, how would you explain this (respectful)atheists thought re: Jesus?

We need to know what the bible means, and when people put things down that yes, they certainly believe, we want to know how we believe. So, here is the comment, with respect returned to this atheist who feels this way: But to be fair to the Christians. They did NOT need Jesus to be crucified for... show more We need to know what the bible means, and when people put things down that
yes, they certainly believe, we want to know how we believe.

So, here is the comment, with respect returned to this atheist who feels this way:

But to be fair to the Christians. They did NOT need Jesus to be crucified for their sins. Jesus took that upon him SELF. Which is why they follow him. Because they believe that he did an in-repayable favor to humanity. (capitals added by me).

This turns out to be a decent doctrinal point, and one we need to be able to explain.
I would have my own explanation, and am interested
in hearing your explanation.

Wondering how you will answer here. It's clear enough, but
then there is explaining it.
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