So, I always interpreted that passage to mean, at that moment, Jesus took all the sin of past present and future upon Himself. He could not longer see the Father, since the father was light and he was darkness. For Jesus to exist with all darkness upon Him, the Father must not be in that same space at the same time. As hell is an absence of God, so with sin, we can only know it's sin when God is not present. If God were there, we would not know it was sin.
I'm still fighting though. Still fighting.
It was only my opinion, we won't know what was the correct way to read all our holy books until after we're dead, and then it's too late! We just better hope that Islam is not the true religion, because I don't fancy drinking molten lead and eating thorns for eternity - while suffering eternal hunger and thirst which will drive us to do so. As it happens, it makes little sense for a God to want to punish man eternally for a few decades of disrespect. No point to that. Something a Satan-type would do, not a Creator.
But you can see how complicated the light and darkness explanation is. A guy is dying to death on a cross, and he says something that sounds straightforward, like he's talking to God as you and I might do. Then 325 years later, some bishops who weren't at the scene, get together and decide it means something less obvious, that he's speaking in a one-man code. It just doesn't help things if someone is sending a message which his hearers are incapable of understanding without an enigma device.
I can't remember who wrote it, but someone did, that the story of Jesus would be more powerful if the message was 'here is a good man, who so impressed God with his uprightness, that he became number one in heaven' rather than 'God "had a go" at being a man for a while'. In the first case, it also sends the message: think twice before picking on the small guy - you never know who he might be friends with!
Otherwise, for example, Judas becomes just a puppet playing a pre-ordained part, which kind of turns it into a pantomime. JMO! (Sesame street was brought to you today by the letter 'p')