I’m an atheist (or an agnostic, since I lack belief in god, but don’t postulate he doesn’t exist).
As such, I have wondered about the meaning of life. I think religion gives it to many people. And I feel that many people don’t find atheism very comforting, because it supposedly makes life meaningless. But I disagree that it does.
First, I don’t think there is such a thing as objective meaning of life. Meaning is given to things by living individuals, or any beings with minds. What is the meaning of word “lame”? It’s what people say it is. What is the meaning of love? What’s the point of music? Whatever you use it for. Even if god exists and has his own meaning for your life, it doesn’t make it the objective meaning of your life. It’s still his personal meaning. You can still have your own meaning for your life, except it would be some kind of rebellion (if you assume god is of the Christian type, or something similar).
So, I don’t think you are missing out on anything if there is no god giving your life meaning. If it has no meaning, you could make your own, or let others make it for you. Perhaps the latter is what people are more comfortable with?