Jürgen Habermas, one of the contemporary world's leading political philosophers and no Christian (as far as I know) recently said this (according to Philip Jenkins:
“Christianity, and nothing else, is the ultimate foundation of liberty, conscience, human rights, and democracy, the benchmarks of Western civilization. To this day, we have no other options [than Christianity]. We continue to nourish ourselves from this source. Everything else is postmodern chatter.”
Wow. Full marks to Jurgen!