"The Second Vatican Council, recognizing and making its own an essential principle of the modern State with the Decree on Religious Freedom, has recovered the deepest patrimony of the Church. By so doing she can be conscious of being in full harmony with the teaching of Jesus himself (cf. Mt 22: 21), as well as with the Church of the martyrs of all time.
"The ancient Church naturally prayed for the emperors and political leaders out of duty (cf. I Tm 2: 2); but while she prayed for the emperors, she refused to worship them and thereby clearly rejected the religion of the State.The martyrs of the early Church died for their faith in that God who was revealed in Jesus Christ, and for this very reason they also died for freedom of conscience and the freedom to profess one's own faith - a profession that no State can impose but which, instead, can only be claimed with God's grace in freedom of conscience."
Pope Benedict XVI