I think it's possible to see morality as a protocol for interacting with others that produces the best outcome for life on earth. What I mean is, you can logically conclude that life on earth is better if we all agree not to steal each other's stuff or perpetrate violence against one another. Therefore we should all agree on a natural law that forbids these things.

However, it's easier to justify this in the light of a God who created all things. If we are all children of God, created in his image, then we honor that God by loving one another. Your enemy is also a child of God. When we hurt one another we dishonor our creator. When we hurt the earth, destroy the environment, we also dishonor our creator, who created all these things for us and gave us dominion over the earth.

Jesus told us that God is not the god of the dead, but the god of life. All life comes from him.

The universe is entropy, but from that entropy arises order. In that order is life. Look at the complex structure of DNA. Simple elements combined together create something more then the sum of their parts. It's hard for me to look at this order from entropy and not see the intelligent design of a creator.