“But I’m an atheist and my life is very meaningful!” This is the retort I’ve encountered often… It’s usually followed by a list of worthy activities and valuable relationships enjoyed by that person. My reply is simple: “I don’t deny for a moment that your life is very meaningful. But that’s true in spite of your atheism, not because of it!”

Atheists certainly do have meaningful lives, yet that’s only because their atheistic beliefs are false. A person can deny the existence of God and still have a meaningful life. But this fact no more proves that life can have meaning without God than a person who denies the existence of oxygen and still enjoys good health would prove that you can be healthy without oxygen. It only proves that people can hold beliefs at odds with reality. — James Anderson (from, Can Life Have Meaning Without God?)