We’re not under O.T. law. Jesus & Paul BOTH addressed this issue.
It is a standard principle of reconciling the Old Testament with the New Testament to observe explicit reinstatement of OT principles in the NT. Murder, for example, is prohibited in both. Is there a repetition of the “conscientious defiance” principle in the NT? Yes:
Act 5:28-29 Saying, Did not we straitly command you that ye should not teach in this name? and, behold, ye have filled Jerusalem with your doctrine, and intend to bring this man’s blood upon us. Then Peter and the other apostles answered and said, We ought to obey God rather than men.
Lest you argue the apostles were merely rejecting faulty religious authority but not civil authority, I would remind you that 1) in Israel at that time the Sanhedrin et al were the undifferentiated combination of religious and civil authority, acting as willing local agents of the Roman Empire (when it suited them, of course), and 2) Peter’s words enunciate a general principle of breathtaking scope: We obey God rather than Man. No differentiation on particular governments or OT/NT particulars, but stated as broadly as possible, so no reasonable reader of the future could possibly miss the point.
Next question?
Act 5:29 "But Peter and the apostles answered, "We must obey God rather than men."
Background: Peter was being told not to preach Christ crucified and resurrected, but Peter was commanded by Christ to do just this. This is the basic appeal that we defy the laws of men when they conflict with the word of God.
The "render unto Caesar what is Caesar's, and unto God what is God's", and Paul's admonitions to obey the government are only when the government is not advocating us to betray the Christian conscience. So, we should obey the speed limit and pay taxes, but we should not be forced to violate our moral principals.