Conscience and the Moral Argument as Evidence for the Goodness of God.

[The Grand Nudger]

A typical argument would go something like this:

1. If objective moral values exist, then God exists. 

Incorrect.  Objective moral values are premised on the existence of moral facts.  Nothing more, nothing less.

 
2. But we know from our Conscience that objective moral values do in fact exist, and this is a properly basic belief for virtually everybody, including atheists (e.g. that certain acts are intrinsically and objectively evil, like e.g. murder, rape etc, irrespective of the subjective beliefs of murderers and rapists etc).

Incorrect.  We don't know with our conscience.  We feel.  If moral values are determined by how we feel, that would be a purely subjective, not objective, morality.

3. Therefore, granted the fact of the existence of objective moral values known through our Conscience, we can reasonably conclude that our awareness of this Eternal Moral Law came from the Divine Law-Giver Who made us. 

Even granting both flawed premises, the conclusion does not follow....and is itself incorrect.  An eternal moral law from a divine law-giver is a subjective, not objective, morality.

Thus, since the objective moral law exhorts us to choose good and avoid evil - even if evil may be in our self-advantage - it is clear that that impulse within us could only have originated from an Essentially Good Being, thus refuting the opinion that God might be evil. 

Objective moral values tell us what a things moral status is.  Whether or not we're compelled by that status is personal and variable.  It's not at all clear our own personal impulses could only originate from an essentially good being, nor that their existence modifies the moral status of any objectively immoral thing a god does, did, or is credited for.

Thoughts? 

God Bless.

I think you might want to familiarize yourself with objective morality before you attempt to leverage it for an argument it couldn't seal anyway.  The outcome won't change, but your performance in the attempt might.