Why Christianity "Works"

A sociological approach. Of course, it seems to me that believing in Christ because Christianity "works" because it fosters personal responsibility and social cohesion is utterly irrelevant to faith. If what Jesus said is true, it would not matter if Christianity failed to "work". And there is great danger in treating faith this instrumentally. If you're not careful you end up like George W. Bush, who mistakes faith for self-help and religion for politics.