It seems ok to me to display the flag somewhere in the church. For most people, it's part of the furniture, nothing else. Could be a reminder that we are part of an earthly community in which we ought to apply the lessons learned in church to the everyday world out there. Love of country does not necessarily imply chauvinism. Although that is a danger, it is not inevitable. Like love of anything, we should want the best for the object of our affection; spouse, friend, family, nation. Which means loving the good, and trying insofar as one is able and it is prudent to dos, correcting or at least pointing out the faults. Of course, "in all wisdom" as Scripture saith. . I always liked Norman Thomas's quote: "If you want a symbolic gesture, don't burn a flag; wash it."