Why shoud we? By that very logic those same founding fathers should have obeyed their King over the issue of a very minor tax, instead of sinning against the will of God by rebellion.
"Why shoud we? By that very logic those same founding fathers should have obeyed their King over the issue of a very minor tax, instead of sinning against the will of God by rebellion."
So that's why they revolted, over a "very minor tax"? Last time I checked, there was religious oppression and injustice.
You seem to be comparing obeying God under unjust conditions with obeying God under friendly and biblically conducive conditions.
"Why should we?" Christ commanded us to influence our world for God. That is why. We are to be salt and light. The founding fathers of America incorporated these principles into the Constitution so that we could obey Christ.
We have been given freedom of religious speech. Each individual has been given leadership obligations by the Constitution, i.e., governing officials are now your agents and my agents for us to influence for the cause of good. Since you have been made a leader by your government to influence your legislators and also made a leader by Christ (if you are a Christian) to "make disciples" and influence society, then you can't just do hardly anything and expect the blessing of God. Therefore "give unto Caesar".