Socrates was a Greek pagan as were all of the Greek philosophers. Plato had some things right - ideals do exist - problem was the greek gods were not big enough to be the source of the ideals. So, using Greek philosophy as your proof God's moral precepts are arbitrary doesn't work. It may have been arbitrary for the Greek gods, but not the REAL God. The Christian God is much bigger than any of the Greek gods - their gods were limited in their power and authority.
Your problem goes deeper than this, however. If morals are arbitrary, then there is no right and wrong, except that which man states as his personal preference (or societal preference). On this basis, relativism is your only refuge. If relativism is your only refuge, you are in big trouble because moral relativism is logically and practically indefensible. I can e-mail you a sound refutation for moral relativism if you like.
I suppose moral relativism can be blamed for Moses giving out the wrong rules concerning divorce. I guess he was the first democrat leader.
Where did I mention relativism? Where did the article mention relativism? Who claimed that morals are arbitrary? I'll state my own postition, if it's all the same to you.
In the meantime, I understood to you say that morality cannot exist without the Christian God. You have yet to support that contention.