Is there an Agnostic that has written anything on dealing with life, death, sadness, emotions, happiness, etc?

I consider myself Agnostic and I feel more liberated than ever just being able to say "I don't know". I was searching for so long to find my own religion or something to believe in, etc. I finally thought "How can anyone really know for sure?" and from that, along with the state of exhaustion and depression that not having found anything to believe in, I called myself an Agnostic. Is there any writers out there or websites who claim to be Agnostic who have written things on dealing with life in practical terms? Things like Happiness, Death, Life, Work, etc. It would just be nice to have some kind of inspirational works to live life by. I dunno. What do you think?