Such witness and work does cross over into the political realm. Christian testimony must not shrink back from its theopolitical implications, even if it must be vigilant not to be seduced by the temptations of proximity to political power.
What else is not an option?
Do a lot of Christians get into public positions of power and either shrink back from mixing Christianity and politics or succumb to integrating a certain orthodoxy of Christian belief into the way that things should be governed, the way that power should be wielded?
The revolution of Christ and Christianity is that his followers don’t need to attain power for Christ’s sake. That is very much not the point, certainly short-term (lifetime-term) speaking.