I think it's something like this: the West for some time has been the best... or perhaps the least worst place to live in all of human history, and so to him if this was a result of the Judaeo-Christian framework, then there's something about that specific vehicle that made it superior to the other ones, even if they were all viable modes of transport themselves. He has deconstructed things from other religions and mythologies, but in his eyes, the proof is in the pudding that there's something about this particular one that has led to the best outcome culturally, which is why he's spent the most time delving into it.
If we take Buddhism for example - and I don't claim to be an expert - it's a largely a religion of renunciation and of participation from the world; material reality is an illusion to be overcome in the search for enlightenment, versus the JC take which involves active participation in God's creation. There's certainly elements that are shared, but there's also differences like less of an emphasis on spoken truth and in particular of family, building community and going out into the world. You clean your room... then sit on your zafu cushion in blissful contemplation, which can do a lot for you personally but perhaps less for the society you inhabit.