I think it’s unfortunate to constrain it to written history. Linking the commonalities between the proto-Indo-European religions like the Germanic, Greek, Persian and early Hindu traditions and just how they interacted with things from the semitic and then Buddhism to taoism and neo-Confuciusism which also influenced back West.

The history of religion is incredibly convoluted but really teaching how syncretized religion is would be a great value. Not to Christian nationalists of course.