In that case, he's correct, he doesn't know. OTOH, while it's impossible to study all large human societies in complete isolation, we can look at the trends across the human spectrum. Asian and European cultures are different due to their histories, including religions, and environments. The common element being they are all human. Although humans can be very barbaric, human society across the spectrum seems to be moving away from barbarism.
It doesn't take a rocket scientist to figure that if you change the variables in an equation, the outcome will be different. Agreed, without Christianity, Western history would have been different, but as noted above, I think there would still have been progress toward a more civilized human society. Note that the Greeks came up with democracy several centuries before Jesus. Rome had a Republic until Caesar fucked it up 50 years before Jesus. In fact, if he hadn't turned Rome into a dictatorship, would there even have been a Jesus since it was the Romans who crucified him?
A society's beliefs are a driving force for change be it the American Revolution, the French Revolution or Putin's invasion of Ukraine. In the latter, who could have predicted the Ukrainians would have survived Putin's invasion? Certainly not Putin. LOL Even if Trump withdrew support, the Ukrainians would fight the Russians just like the French Resistance fought the Nazis or the Irish the British. Christian beliefs helped colonize America be it the Spanish version or the British and French versions. John Locke, the "father of liberalism", was rooted in Christianity. The age of Enlightenment produced men like Thomas Jefferson and Benjamin Franklin. Both were more in tune with the Sermon on the Mount than the Holy Roman Empire meaning, although not dogmatic, were more Christian than the Catholics and Protestants.