My cat died and suddenly I believed in the existence of a Soul

That pretty much says it. I have never believed that we, humans, are anything more than a bunch of chemical reaction and nerve impulses; that when we die we become food for worms and that the only "afterlife" lies in the memories of those who continue to live beyond us. But my cat got a brain tumor and when he was sick, before we knew what was wrong I looked into his eyes and saw something there that was beyond scientific explanation. I thought, "this cat has a soul and he is going to be reincarnated in an even more enlightened form." That was it. I suddenly believed, after all of these years of staunch atheism, I experienced faith.
Then I realized that if I believed that we have a soul, then I had better find mine.