It is not justice to punish the innocent for the actions of the guilty.
If any of us--or any human anywhere--is completely innocent of any transgressions against other people or against God's order, standards, and expectations...if he or she is perfect, in other words...
then please identify him or for us.
And here's a hint...the Bible teaches us that there is none.
It is not justice to punish yourself for the actions of the guilty.
I don't know where you picked up that idea. So long as doing so is not coerced, it is supremely loving to sacrifice for another. Good parents do it every day, as a matter of fact. Couldn't the Almighty, Our Father, do the same?
A God who changes sinful people into their original nature and simply forgives them is a lot more just than a God who punishes Himself and then forgives those who believe that He punished Himself.
That's strictly a personal opinion, isn't it? It's your theory. And it's a guess, that's all.
Besides, you misstated the point. Neither I nor the Bible suggested that God "forgives those who believe that He punished Himself." The belief is that Christ's allowed the authorities to punish him, thinking him guilty of several laws that other people were known to have violated.
Simply believing that God punished himself for no good reason wouldn't mean much, I agree.
I'm familiar with that absurd doctrine and I reject it.
Quite a few people in history have rejected Christ in the same way, but I cannot make you believe in Our Lord or in the Bible, as the case may be. What I am doing is just answering your questions and pointing to your mistaken premises, hoping that you'll reconsider.
Now you're free to tell us that you don't want to accept any of it. But you
don't get to come up with your own version of Christianity and then reject that version while imagining that you've identified the Christianity's fatal flaws.