Unless there is a God, all morality is just opinion and belief. And virtually every atheist philosopher has acknowledged this.

There is little question Islamist terrorists and molesting clergy have both played a role in the rise of atheism in our time.No atheist activist is nearly as effective in alienating people from God and religion as are evil ‘religious’ people.

Belief in God means more than believing God exists; it also means believing God cares about us. After all, if God exists but doesn’t care about us, what difference does it make to us whether God exists? For all intents and purposes, there is no difference between atheism and the existence of a God who doesn’t care about us.

Another problem with the view that you don’t need God to believe that murder is wrong is that a lot of people haven’t shared your view. And you don’t have to go back very far in history to prove this. In the twentieth century millions of people in Communist societies and under Nazism killed about one hundred million people—and that doesn’t count a single soldier killed in war. So, don’t get too confident about people’s ability to figure out right from wrong without a Higher Authority.