In the days when Jesus was around, Israel was a theocracy. A theocracy is a nation run largely under the control of religion. The same was true in western culture when the Holy Roman Catholic Church dominated political entities and nations in Europe.
In Matthew 12, there is a confrontation between Pharisees and Jesus because he and his disciples are picking grain and eating on the Sabbath:
At that time Jesus went through the grain fields on the Sabbath. His disciples were hungry and began to pick some heads of grain and eat them. 2 When the Pharisees saw this, they said to him, “Look! Your disciples are doing what is unlawful on the Sabbath.”
3 He answered, “Haven’t you read what David did when he and his companions were hungry? 4 He entered the house of God, and he and his companions ate the consecrated bread—which was not lawful for them to do, but only for the priests. 5 Or haven’t you read in the Law that the priests on Sabbath duty in the temple desecrate the Sabbath and yet are innocent? 6 I tell you that something greater than the temple is here. 7 If you had known what these words mean, ‘I desire mercy, not sacrifice,’ you would not have condemned the innocent. 8 For the Son of Man is Lord of the Sabbath.
It wasn’t until the Magna Carta was signed in 1215 that state was declared independent of church and had rights beyond the King (titular head of the nation who endorsed the idea of a state church). In its Constitution, the United States took the idea of separating state from church as a mandate. Today, church and state still are separated by legal and ideological arguments but few lawmakers and citizens are able to properly separate the two. Admittedly, there is conflict in interpretation not only between the US Government and the several religions but also between the religions themselves.
Trumpian religious groups (largely evangelical) have the attitude of the Pharisees claiming that religious principles trump state principles (enjoyed the pun). It is easily seen that Trumpians would prefer a theocratic rule of law.
Other religious institutions support humanistic and compassionate ideals as the higher ethic. Jesus’s rebuke of the Pharisees is right on the mark for today’s immigration debate:
“…If you had known what these words mean, ‘I desire mercy, not sacrifice,’ you would not have condemned the innocent.”
The separation of church and state works best when the state manages state responsibilities and the church manages spiritual and ethical responsibilities. It is a tough choice for conflicted citizens: should we sacrifice immigrant’s lives because they violate state law or should we seek compassion and mercy as a separate influence on the matter.
Trumpians are Pharisees.