Jesus, the founder of the Christian Church, never precisely stated his opinions on mixing religion with government. However, one passage from the New Testament supports the theory that when it came to religious affairs and government, Jesus thought they were separate things altogether.
Christians are familiar- or they ought to be familiar- with this story from the life of Jesus, in which, he outsmarts a shifty lawyer.
Then the Pharisees went out and laid plans to trap him in his words. They sent their disciples to him along with the Herodians.“Teacher,” they said, “we know that you are a man of integrity and that you teach the way of God in accordance with the truth. You aren’t swayed by others, because you pay no attention to who they are. Tell us then, what is your opinion? Is it right to pay the imperial tax to Caesar or not?”But Jesus, knowing their evil intent, said, “You hypocrites, why are you trying to trap me? Show me the coin used for paying the tax.” They brought him a denarius, and he asked them, “Whose image is this? And whose inscription?”“Caesar’s,” they replied.Then he said to them, “So give back to Caesar what is Caesar’s, and to God what is God’s.”When they heard this, they were amazed. So they left him and went away.
That’s probably a familiar passage even to people who are not all that devoted to the Christian faith. Besides showing that Jesus could argue as well as any lawyer of his time, or that his audience was not merely gullible village folk- it also demonstrates something else. Jesus himself believed that the realm of the government and the realm of religion were not to be intermixed.
In his time, the powers of Caesar was not merely the head of government but, as a emperor of the known world, he was the government. His obscure whims required absolute obedience.
Judea was little more than an occupied colony of Rome and dissent- even in its mildest form- was not tolerated. It was a case of "you are either with us or against us."