Romans culturally ate less meat and frowned upon their Northern Germanic Tribes who almost always ate meat. They were more frugal in their way of life.

The Germanic Tribes were also taller and were acknowledged by Romans as formidable warrior.

Culturally tho, Romans were South Europeans and assimilated what we call South Italy and Greece now.

They also captured parts of middle east but culturally they never became Romans.

>3. ... And where the dominant religion is still the Roman state religion. Which was lorded over by the Roman state church for a thousand years before an angry German monk suggested that this was really weird and could we keep the book and get rid of the pope.

There were other Pagan religions at the time and in middle east Jews didn't accept Roman state religion.

But then again, people born in Roman Empire got Roman citizenship on Birth so it didn't matter what you were culturally or religiously or tribe/ethnicity.