Bruna Frascolla
Darwin wasn't an agnostic by conviction - he was an atheist who rejected Christianity as immoral.
Friends were surprised when I described Darwin as the only major scientist who was unequivocally an atheist, given that he considered himself an agnostic. I confess that I tend to erase this label in my memory, because the formal distinction presumed by it-to wit, the idea that an agnostic does not know whether God exists, while an atheist knows that God does not-does not correspond to reality.