I used to be a strong catholic, but after having many debates with one of my friends at school (the only other atheist i know) I realized I had no answers to his questions and no counterarguments to his point. So after thinking about the topic for many months I generally lost more and more faith until now where I don't believe that a god exists. Personally I did not find the loss of faith depressing, rather I found it to be quite amazing. I feel much more enjoyment finding answers than saying it was a magical being that did it. I'm really glad I have this friend, because without him I'd still be mindlessly praying to a God instead of finding solutions on my own. To you're question darkmatters losing faith is not depressing and as terrible as you think it is to me it was one of the best things that has ever happened in my life.