The christian idea of the "soul" is different, period.
It's not clear what Christians mean by "soul" ...
For example, I once asked a Mormon about these things, about who I really am. He replied "And if you don't even know that, then you have serious problems and should seek professional help, you need to go to a psychotherapist." A Protestant and a Catholic sent me off to a psychotherapist as well for that same issue.
If the spirit soul experiences suffering, then it serves no purpose, as we don't need to die to achieve this.
That would mean God experiences great suffering, meaning that God is just a infinate version of us. What would be the point.
Justice would be the point - the sort of justice that is in line with the notion that God birthed himself in the human form and killed himself or got himself killed, but it wasn't really a killing because he was resurrected, but we should think it was a killing for that's the way we can be saved ... or is it that Jesus, as the son of God, suffered the pains of crucifiction infinitely more than humans do, this is why his crucifiction isn't a "simple" crucifiction, but a divine, infinite crucifiction ...
Anyway, on the one hand, I find this rather stupid and agree with you when you say that "such an understanding is more
super secular humanism than theistic". On the other hand, though, I find it hard to believe that this Christian belief that so many humans have invested so much into and so many humans and animals suffered so much from it, that this Christian belief is nothing but a stupid trifle, an error that simply took great proportions, but is an error nonetheless.
Just the other day as I was cleaning up, I came upon some astronomy magazines and took a quick glance inside - all those charts, telescopes, satellites, theories, so much time and money spent. I really find it hard to believe that humans could spend so much time and money on something that is actually insignificant.
I am still inclined to think that there is some great relevance in astronomy - and in most other fields of human endeavor, especially science and art - that justifies spending so much time and money on it, and that I am just too stupid to see this relevance.
I'd still sooner believe that I am stupid and limited, as opposed to believing that human society really is that stupid to spend so much time and money on things that don't really matter.
But perhaps I will have to rethink my position on this.