2) If we are creatures that have evolved, the doctrine of Survival of the Fittest is the ultimate, primary, and most reliable basis for the establishment of moral truth. Thus, any action that promotes my survival is justified.

According to evolution, Survival of the Fittest is conclusively, inextricably connected to life. Life depends on this principle — if Miller is right. Based on his premise, advantageous acts must be morally justifiable. Theft and murder and rape can all enable me to survive and pass on my genetic material to future generations, making the acts morally justifiable.

Theft, murder, and rape may temporarily advantage the individual, but they undermine the group. Humanity has lived, in all times and places, in groups - it is to our advantage to constrain acts that disrupt the group. What is to our advantage in an evolutionary sense and what God commands is largely complementary in this case - and indeed, why would it not be? Would God give us a set of rules that were disadvantageous?

Would God give us bad or absurd rules for living or practical ones that benefit us? Would he give us a snake when we ask for bread?