[NickGrass]

Christians believe that you only have one shot at salvation and that is in this life. You must believe in Christ now or suffer an eternity in hell. This creates a sense of urgency to reach those who need the "gospel" and who would listen to what you have to say easier than the person you just saved from starvation or rebuilt their home, etc. Most of what Christians do from a charity perspective is a means to proselytize. Partly but also because a possible summary of the new testament is "Love your neighbour". Some Christian charity is given out of base reasons but some is undoubtedly given out of that peculiarly Christian type of love.

If one person attains enlightenment that is of far greater good for the world than if you feed a million. I take it that that's some kind of rhetorical claim which I'm failing to understand; nobody could really believe that their salvation is worth a million lives.

Buddhist should focus on personal attainment because that is the only way to solve the worlds problems No it's not. Sitting on a cushion isn't going to stop climate change or another war in the Gulf or any of the other horrors which lie in wait for us. Personal attainment is an admirable goal but it's solipsism of the highest order to think it's going to change the world.