Well, I have room for the finding of metaphors or allegories in the gospels since I think they're mostly fictional. But Jesus's final cry there is an allusion to Psalm 22, so the intended meaning is found in that psalm: even if you doubt God, your faith should bring you back to trusting and praising him, etc.

Still, I agree that the esoteric meaning of Christian theology is likely closer to Gnosticism or secular humanism.

Your point is also similar to Jung's interpretation of Jesus's death, which I talk about here:

https://medium.com/deconstructing-christianity/jesus-died-for-gods-sins-87260817ced8?sk=685f481bc95a3a9d42c780589da05577

I also make a similar point in pondering why God would have created something apart from himself:

https://medium.com/the-philosophers-stone/tyranny-and-the-horror-of-being-god-3a77f319ca77?sk=441d211f36d0127ccbf6bfbd94fe1771