You make that choice when you decide to run for office.
I strongly beg to differ. It is a very Christian endeavor to be engaged in the civic order of our communities and states and nation. Jesus said, “Occupy until I come.” We may be called and qualified to do that service unto Him through holding public office. Also the Jews dragged off to Babylon/Persia were told to work for the blessing of the host nation, as they would be captive there 70 years, and it would benefit themselves to do so.
One does not have to set aside godliness to be a politician. Many do, but not all.