Fish In A Barrel ...

If there is no God, the labels "good" and "evil" are merely opinions. They are substitutes for "I like it" and "I don't like it." They are not objective realities.
Every atheist philosopher I have debated has acknowledged this. For example, at Oxford University I debated Professor Jonathan Glover, the British philosopher and ethicist, who said: "Dennis started by saying that I hadn't denied his central contention that if there isn't a God, there is only subjective morality. And that's absolutely true."
And the eminent Princeton philosopher Richard Rorty admitted that for secular liberals such as himself, "there is no answer to the question, 'Why not be cruel?'"
Atheists like Dawkins who refuse to acknowledge that without God there are only opinions about good and evil are not being intellectually honest.