It's a neat idea. I think of gods as alignments already, sort of the reverse. That's how I justify it when gods of different pantheons meet - they are actually the same gods, it's the humans (or animals) who see them in their own images.

I like the statement of neutral alignment just going along with whoever is winning, I think that's the essence of neutrality, though still wanting to see themselves as decent.
I use law and chaos as in-betweens for good and evil. I recognize that it seems like a bit of a cop-out, but at the end of the day I keep coming back to it.

Someone good genuinely feels for others. They are motivated by mercy.
Someone lawful has an idea of good without really understanding it at their core. They see it more as justice.
Someone neutral takes the path of least resistance. Fear keeps them from being too good or too evil.
Someone chaotic is unreliable, perhaps crazy or otherwise less compassionate than someone neutral.
Someone evil genuinely enjoys dominating other beings far more than they are troubled by it.