Christian Ethno-Nationalism need not be inferred by the Holy Scriptures, by rather directly attributed to a vast swath of Biblical literature.
Nations — distinct ethnicities with defined and contiguous borders — are explicitly mandated in the Bible.
Kudus to the Z-man for tackling this subject; my hope is only to add to what he has said: https://thezman.com/wordpress/?p=31117
https://www.brighteon.com/1ffc0ae5-e145-41c5-8ad7-15fd49cbc35d