There is a passage in Darwin's autobiography (or more precisely, autobiographical sketch) that I particularly like. I still remember how moved I was when I first read it long time ago:
But I was very unwilling to give up my belief; I feel sure of this for I can well remember often and often inventing day-dreams of old letters between distinguished Romans and manuscripts being discovered at Pompeji or elsewhere which confirmed in the most striking manner all that was written in the Gospels. But I found it more and more difficult, with free scope given to my imagination, to invent evidence which would suffice to convince me. Thus disbelief crept over me at a very slow rate, but was at last complete. The rate was so slow that I felt no distress, and have never since doubted even for a single second that my conclusion was correct. I can indeed hardly see how anyone ought to wish Christianity to be true; for if so the plain language of the text seems to show that the men who do not believe, and this would include my Father, Brother and almost all of my friends, will be everlasting punished. And this is a damnable doctrine.
I like this passage not only because I agree with what Darwin said, but also because my experience was similar to his. I felt like he was speaking for me too.