Hybrid

Stephen Hicks notes:

The modern West is hybrid civilization, drawing upon competing ethical traditions from Greco-Roman culture and Judeo-Christian religion.

This put me in mind of an idea from biology, "hybrid vigor":

The term heterosis, also known as hybrid vigor or outbreeding enhancement, describes the increased strength of different characteristics in hybrids; the possibility to obtain a genetically superior individual by combining the virtues of its parents.

Greco-Roman culture was itself a kind of hybrid, between the Greeks and the Romans, obviously.

Christianity itself sprung to life in an interaction between Judaic culture and Greco-Roman culture. Jesus spoke a Semitic language, Aramaic, but the New Testament survived in Greek.

And there's a case to be made that the Judeo-Christian tradition includes elements absorbed from both Egyptian beliefs (you will be judged in the afterlife) and Zoroastrian beliefs (the world embodies a cosmic struggle between good and evil).

Here in America, just to complicate things, we now seem to be in the middle of an attempt to come to terms with some Eastern belief systems.

With logic from the Greeks
we sort through diverse convictions.

The mind painstakingly seeks
belief without contradictions.