In his book, The Arguments for god, John Hick writes
Let us consider the case-the admittedly extreme case – of the humanist who knowingly sacrifices his life for the sake of humanity as a whole. We are thus thinking of self-sacrifice on moral principle….
And the question I wish to pose is how such conscientious self sacrifice can be defended in humanist terms as rational or reasonable act?
And I will offer to argue that no such person exists, either among theists or non theists. I further suggest that the word self-sacrifice is a word that has no place in the dictionary. Additionally if a person wants to use this as an argument for the existence of a god, they should think again.