Apologetics open challenge

[Angrboda]

I nearly forgot about this thread.

Here's another argument:

God cannot decide what objective morality is, or else it would be arbitrary. 
Objective morality thus cannot be created by God.
If God cannot create objective morality and decide what is, then neither can evolution, as God can create evolution.
Objective morality exists.
Thus objective morality is eternal.
Objective morality takes a perception to see.
Thus an eternal being who perceives objective morality always existed.

You're missing a step.  "Objective morality must be perceived in order to exist."  Unfortunately that tends to give the game away by revealing this "objective" morality as merely a concept in the mind of this eternal being, ergo, subjective.