During Christ life crucifixion was mainly for Slaves and Rebels. The choice of execution could give us insight on how led his life. Was he a slave? No (1 ).
If Christians are supposed to be subservient to government or almost always obey the government how could it ever start or by some off chance it started why didn't it die off?
The high priest Caiaphas, knew Jesus was a threat to the political interest of the nation. Only Pilate could impose the death penalty. Pilate was skeptical of Jesus being a threat to political interest, but he relented, and gave Christ the death penalty. A skeptical Pilate literally washed his hands of the matter (2 ).
Tiberius was the emperor of Rome when Christ died. The fact he was executed by the state indicates a hostility toward Jesus and his message. How did his followers fare after Christ death, were they accepted? No they were persecuted, and defied hostile governments.
Nero was emperor of Rome from 54-68 CE. Persecuted Christians an example is after a fire burned a large residential area. A fire he could have caused, he blamed the Christians and some were executed by crucifixion or burning or by wild beasts in the circus (3 ).
Next was Domitian, Titus Flavius (51-96), Christians, were also persecuted during this time. Being a Christian was a capital offence, but this could started with Nero(4 ).
After that was Trajan carried on the tradition of persecuting Christians (5 ).
When early Christianity became an established religion in Rome, Church founders insisted church power and state power remain separate (5 ).
Still the Catholic Popes over time have disagreed with this stand. Pope Gelasius I (492-496) had the "theory of two swords.". But they were not equal the first (sword) was the church and it had greater power. Pope Pius IX in 1864 issued the "Syllabus of Errors", which attacked the separation of church and state. Under the Second Vatican Ecumenical Council in 1962 Pope John XXIII soften this stand (6 ).
Other Christians dissented
Theologian Roger Williams (December 21, 1603 – April 18, 1683) believed in a "hedge or wall of Separation between the Garden of the Church and the Wilderness of the world." (7 ).
Protestant Reformer Martin Luther said "For this reason God has ordained the two governments; the spiritual, which by the Holy Spirit under Christ makes Christians and pious people, and the secular, which restrains the unchristian and wicked so that they must needs keep the peace outwardly, even against their will. So Paul interprets the secular sword, Romans xiii, and says it is not a terror to good works, but to the evil. And Peter says it is for the punishment of evil doers. . . . " (8 ).
Theologian John Calvin rejected any notion "to seek and include the kingdom of Christ under the elements of this world" he also noted "[T]he spiritual kingdom of Christ and civil government are things very different and remote from each other." (9 )