Darwin's unbelief

I have been reading a biography of Darwin recently. If there is any doubt in anyone's mind as to his spiritual standing, his autobiography makes clear that by the time h wrote his famous Origin of species he was full of unbelief. He stands as a warning to all who depart from the truth. I think this passage is particularly striking:

Thus disbelief crept over me at 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

For the whole section see here.