So put all that together. The result is incoherent.
Who or what really died on the cross? The one being of the Godhead? No, merely one of the three persons. But if that person is inexplicably and inseparably linked to the other two persons, then how could he die without them also dying? Or did the Trinity get reduced to a Binity for three days? Surely nobody who holds to the idea of the Trinity could accept that? But if the second person of the Trinity didn't separate from the life of the other two, then what was it that died?
And what was actually sacrificed? Jesus was apparently without a physical body for somewhere less than 36 hours, and then got a better body. That doesn't actually seem like a sacrifice, more like an inconvenience. An exceptionally painful inconvenience, I'll give you that, but not actually a sacrifice. The whole point of sacrifice is to give up something that you don't get back again. Ever. So the resurrection completely undoes the sacrifice. Its like me putting a tenner in the offering plate on a Sunday and then coming back on Wednesday to reclaim the tenner, and actually getting fifteen pounds back. No significant sacrifice, certainly not when viewed on the eternal timescale.
And what about the 'harrowing of hell' thing? If God went to hell, then surely hell ceased to be hell. By definition. Maybe Rob Bell is right and
I've got no major point to make here other than that when you scrutinise some of the doctrines of Christianity, they don't actually work. And especially, when you try and harmonise them, they don't always work together.
For what its worth, having wrestled with both issues over the past few years, I no longer find either the doctrine of the atonement or the doctrine of the Trinity actually makes sense. It may be that someone died on a cross two thousand years ago, but I can no longer accept that that person was inseparably part of God or that there could be any transaction in that death which took my place in some death that I should actually have died myself. There would be no justice in such a deal.