The interesting thing is, the same societies that have advanced the most in the last 500 years are also the same that advanced the most 2000 years ago as well. Europeans for the most part just happened to be more advanced, which is why they ended up conquering the others and continue to advance rapidly. In the game of life, those with a head start tend to exploit that for as long as they can. There's little reason to believe that Christianity had anything to do with it. The ancient Greeks were pretty advanced when they were pagan. Christianity did provide Greece with a second empire (Byzantium) but it didn't help preserve it. In fact I believe Christianity, a religion written and spread mostly by Greeks, reflects the ancient Hellenistic values. I believe you are mistaking those values of personal liberty, expression, philosophy and democracy as originating from Christianity. But you're wrong, these are values that originated from a multi-god society which makes sense as you'd need such values for the people to respect each other. If anything Christianity diminishes the Hellenistic values as it is, like all monotheistic religions, divisive.