I think you're getting downvoted for suggesting that all the great world religious traditions were comparable in their influence on Western civilization, the civilization that the author knows best, is part of, and writes about.

In point of fact, the West draws primarily from the Hebrew messianic tradition and Hellenic philosophy. The influence of other systems of thought, while not literally zero (notably in the case of Islam) is just not comparable to that of Athens and Jerusalem. However valuable these other traditions might have been, they didn't shape the West like these two.