Can there be such a thing as a Christian altruist? How can a Christian make a purely selfless act? You may say, “By offering to give up his life for someone else, etc.” However, belief in the afterlife and God make this (at least indirectly) selfish, since the Christian knows that this act will result in eternal salvation.
It would seem that the only selfless act a Christian can make is one that helps another and defies his religious beliefs. In this way, there is nothing at all to be gained on a personal level.