This is a pretty profound poem my friend. You embody a lot of literary devices in here.

God runs his finger down my back, it flakes me
makes me an old man,

I assume this is some form of metaphor for time?

My body is not my body
it is the ruinous sum of so many first experiences.

I can't help but agree with this. My favorite line!

You're absolutely right though, Adam must have felt a many great deal of fear! I can't imagine being the first man ever to experience old age. To watch my body slowly die down without having any knowledge of why it was happening!