It is true that the Christians were concerned with the abstract 'Kingdom of Heaven' but they divorced themselves from politics in general until much later on... like around the time of the Arian Heresy. Also the Christians were persecuted for not worshiping the images of the Emperor, not the 'old gods' as the Romans were pretty chill with letting people worship their own stuff as long as you gave your dues to the Empire. This was problematic with the Jews before as well.

And the fact that the heart of Christianity was always in Asia until the Great Schism doesn't help your theory very much.