If Jesus came back to life....what was his sacrifice?

[Tonus]

In the Christian view (at least mainstream Christians, Catholics), Christ was fully human and fully divine.

I'm not sure how this is relevant. He gave up the fleshly body for good. He gave up the divine body for a period of time so short that he may not even remember it.

With respect, you have no understanding of this: he didnt just 'die', he was put to death (executed).

Again, how is this relevant? He sacrificed a human life, that was the goal. He could easily have jumped off of a cliff. An archer could have struck him down. Sacrifice complete, no need for a gory slasher flick.

Mainstream Christians simply understand hell as "the absence of God", not as a pit of fire.

Your understanding here is tainted by bible believing protestants, who are not representative of global christianity in the slightest.

Well then, replace "eternal torment" with "eternal absence of god." It remains that god inconvenienced himself for what amounts to a miniscule fraction of the blink of an eye, in order to complete some bizarre plan of his own making. Anyone who recognizes this for the sham that it is would get a much harsher penalty. Very selfish fellow, this Yahweh.