#church v state

This is an intriguing dilemma that many in the church have discussed. What do you think? 

Should the religious person be in the world but not of it? and what does that mean? 

Should the religious person retreat into his or her or their own little worlds or communes? 

Should they send their children to public schools or private schools or homeschool?

To what extend should they engage or choose not to engage?  Is it simply a matter of preference? 

Some might suggest that the mission of the church is to convert as many as possible. If this is an admirable goal, how do they do that and retreat from culture? 

Should Christians - be separate - from the world and politics and life completely? Or should the engage in the public square?

And if so. - whose rules should they follow? The rules that suggested by the organisation they are trying to engage with or their own set of principles?