I have a secular job.
But that's where your reasoning leads.
We've discussed this before, and you ended up conceding that Christians should be good citizens, vote, etc. Since voting is an exercise of governmental power, I assume that you don't consider it sinful for a Christian to hold office and exercise other forms of governmental power -- as a judge, a congressman, president, etc. (Is this a correct assumption?)
If so... then WHAT sort of laws should Christian congressmen vote for? What sort of decisions should Christian judges hand down? For that matter, what kind of candidates and propositions should Christians vote for? Should the scripture inform our decisions on these matters, or not?
If so, then, how is it that you are against political action by Christians? Certainly politics *by itself* saves nobody, but it can hardly be denied that politics an sometimes either promote, or retard, certain kinds of social wickedness.