What unique aspect of Christianity makes your statement true in any way?
How is it the foundation? And in what way does it facilitate the best quality of life?
The Prohibition of lending money for interest a key concept in medieval Christianity?>
The central figure of Christianity was a man who came to serve others by taking care of their physical, psychological and spiritual needs. This is what the NT is all about service and taking care of others. Without these values we would just be like any other animal living in a environment were the strong thrive and the week perish.
Christianity via both the old and new testament has a big focus on individual freedom another key component of western civilisation.
I will sometime this week go through all the 10 commandments and show how they have shaped western civilisation for the better.