I have known people from just about every religion whom I believe has shown true altruism and compassion not for personal gain. I have seen it many times in soup kitchens, maternity homes, automobile accidents, after 9/11 etc.

One religion does not have a monopoly on compassion. People have compassion because G-d places it in their hearts. Some are better able to deal with issues because of their religious affiliations, but anyone can have a gift of compassion if G-d gives it to him.