In a French newspapers, I spotted an article about how judeo-christian religions have been necessary to make moral codes (elaborating on David Cameron's statement) and that without them, we wouldnt have pivotal concepts like democracy, equal freedom of humans, human dignity, ect...
http://www.atlantico.fr/decryptage/cet- ... l?page=0,0
About the latter concept, one of the reporters even claims:
The concept of human dignity could appear only because Christianity developped the notion of the individual, by analogy with the three individuals of Trinity, and because this individual is created by God in His image.
In rejecting Christianism, one still desires human dignity, however one doesn't know what its basis is anymore; and the latter being not given from the outside anymore, in a trascendental way; it's Man himself that is judge of it, hence the
door is left open to arbitrariness and all the excesses that show up nowadays.