Is it the Jesus of popular Christianity? No, apparently not, because most Christians still live with sin and guilt as though it were still in the world. They live as though sins were not forgiven, as though Jesus’ death on the cross really did jack.
The lamb of God is… drumroll please.. da dadada… Friedrich Nietzsche – who railed against draconian Christian notions of sin and guilt, and directly and indirectly (through Freud, Heidegger, Franz Overbeck and others) influenced many leading theologians of the 20th century (Barth, Bultmann, Moltmann, Tillich to name a few). These theologians rejected oppressive notions of God as a vindictive tyrant and presented him as essentially loving and accepting. They did not ignore sin and guilt altogether, but their thrust was that God was no longer interested in sin as a metaphysical reality – that when Jesus gave up his spirit, that which was written actually occurred:
the veil of the temple was rent in twain from the top to the bottom; and the earth did quake, and the rocks rent
The death of Christ was a once for all, cosmic victory over sin. Sin is dead. Sin remains dead. And Christ killed it.
But Christianity mostly rejected this notion. Through flagellation, confession and hellfire preaching, Christendom has done its best to keep the beast alive and keep people in chains with guilt. Christians honestly believe sin is still in the world and that they must think about it and go through the motions weekly at church in order to satisfy a wrathful God. We ought to pity these knights of infinite resignation.
For Christians, Christ’s death was not sufficient for the forgiveness of sins. Thus another sacrifice was needed in order to rid the world of the notion of sin. That came in the form of The Antichrist. Nietzsche had a significant influence on theologians of the 20th century in rejecting the traditional Christian God as a spiteful, vengeful despot. They took their cue from Nietzsche in proclaiming a Gospel of human liberation, an eternal* Yes! to life – as it was always meant to be.
*eternal in terms of magnitude, not time
Further reading: Nietzsche on the Origin of Sin