It is not only compatible, but is in fact the most compatible.

lol.

And what non-shithole do you hail from, again?

One that's not being set on fire by BLM.

Subject to Roman law

Incorrect once more.

The only thing they were disallowed was representation in Rome proper unless they joined a Legion.

Non-citizens were not allowed to join legions, only auxiliaries. You really have no idea what you're talking about.

Mary and Joseph were Christians by definition.

But they were ethnically Jewish, so you would have pushed theme into the gas chambers all the same - like your heroes, the Nazis did to Jewish converts to Christianity.