Atheism doesn't work for me because it is connected to the idea that there is no purpose in the universe, no purpose in a person's life. Aristotle, on the other hand, argues that purpose is a fundamental part of reality (one of his Four Causes).
I fully agree with something that Steve Jobs said in his Stanford commencement address: "You can't connect the dots looking forward; you can only connect them looking backwards. So you have to trust that the dots will somehow connect in your future. You have to trust in something - your gut, destiny, life, karma, whatever." In atheism, you can't have that magic. You are pitted against a hostile environment of random chance, illness, and misfortune. But in Catholicism, there is purpose: purpose in good things, and God can even pull good out of evil things. It is about life, hope, love, and flourishing; in other words, purpose. And I like that.