Politics and religion were not two separate entities in the first century. The Emperor was called the Divine One, Son of God and other such titles. To disagree was considered high treason.
We can't judge first century Christianity, or 3rd or 4th century, by today's standards. It just doesn't work that way. You have to look at the whole context. That means a decent in depth read up of Roman life and living, as a Roman citizen and as a non citizen living within the Roman Empire.