[edsheppa]

Christianity had a significant influence [on the] supremacy of Western Civilization

That case hasn't been made. Certainly Europe was Christian but it was Christian for a thousand stagnant years before the Renaissance and Enlightenment periods and it was in that few centuries that Western Civilization rose above the others. I find it a more reasonable assumption that it was a result of changing attitudes in the period rather than the Christian culture.

[Mr.Atos]

I would agree with that. I would also suggest that it was the concepts of Christianity, the supremacy of morality, and the notion of life as an end in itself, divorced from original sin, that returned some semblance of hope into the people of a decaying Roman Empire. Once the people had grown beyond the values of Greek philosophy and abandoned the authority of their own pagan deities, their reason for being was lost. Constantine codified a renewed sense of being in Christ... albeit too late to save the rotting empire. But, a millenium later, a similar sensibility lent courage to the children of the Reformation giving them courage to trust an unknown world and flee a degenerate land of religious corruption and monarchal tyranny.