Christians often try to justify the punishment of unbelievers with the idea that they CHOOSE not reject God but i've never seen a refute to this: [Spirituality & Religion]

The atheist does not reject god because rejection is a willful act.
Atheists simply aren't convinced that god exists and they can no more choose to be convinced than you can as a believer.

And you can prove this to yourself right here and now.
Observe:

Decide right now that you are in fact convinced that Santa Claus exists....
...were you successful? No? Then you've just proven to yourself that belief is not a choice.
You cannot choose to be convinced by that which you find unconvincing.

So maybe you still think un-believers deserve to burn forever for simply not believing but at least don't try to justify the punishment by victim blaming.