I always found this whole bit farcical.
Firstly, if God is the one who exercises judgement in the first place in the form of who goes to heaven and who does not, then (as is written elsewhere in the Bible) what God says is good, is good, and what God says is bad, is bad, for no intrinsic reason other than God says it is so. When I do the good, I want to do it because I have some stock in the moral value or principle being maximized, not because some deity arbitrarily commanded it.
Secondly, if God is the source of all moral judgement, then he could just arbitrarily decree that repentance is now a thing instead of making Jesus suffer for our sins. In the same breath Christians assert that moral values come from God (if God says it is good, it is good, if God says it is bad, it is bad), but that Jesus had to suffer, to what, to make God decide to be more lenient with how he interprets our sins? How is that supposed to be inspiring? Makes God seem sadistic more than anything. But then when God contradicts his own moral values (i.e. murder in some of the old parables) Christians of course once again say no, this isn't immoral because God says it is not. Which is it? Either morality is whatever God says it is, and Jesus dying on the cross served absolutely no purpose, or God is a sinner and cannot/should not contradict his own moral tenants (but does because there is no one there to "judge" him), in which case Jesus dying on the cross makes some sense because morality is some force above and more powerful than god.