Just a thought but if God is removed from the state and the state no longer has a higher moral authority, but proclaims itself as the highest moral authority, is it still moral?
Interestingly enough... this is what is happening/has happened in the U.S. The results: Gay marriage. Special rights for people based on what they like to put their sex organs into. Special rights for people based on their skin color. The list goes on and on...
So, the answer to your question is, no, if God was eliminated and states (man) were left to decide morality, it would not be moral because it would have no God to answer to other than their own made up gods (money, sex, trees, democrats, etc.) who change based on feelings.