My (Assembly of God) church does not have any flag displayed. I cannot tell you if the staff is Republican or Democrat because that is not what they preach about. Yet, for security reasons we have a uniformed police officer providing security at each of the 3 weekend services. Perhaps we are an outlier, but it strikes me the phone company does not provide the things a government provides: a safety net for the poor, a defense against foreign invasion and domestic criminal activity, enforcement of contract law, provision for a system of law for dispute settlement and a host of other public goods supported by taxes which benefit society and me directly. In exchange I consider the country worth defending.