By lapsing headlong into partisan politics, especially on controversial matters such as “social issues,” otherwise known as “culture wars,” a congregation unwittingly, and, from a religious standpoint, arbitrarily (i.e., dogmatically) constrains (i.e., limits) its potential membership unnecessarily because people who would be open to and even relish the religious dimension but are opposed ideologically to the partisan stance on a political, or social, issue would not be likely to attend the ostensibly religious services. No one likes to feel ideologically uncomfortable or, even worse, despised. This is particularly likely when a congregation turns its building into an ideological billboard. I suspect that this is a distinctly American phenomenon (i.e., taking things too far). Behind the extravagance lies the sin of pride, wherein a person erroneously believes that he or she cannot be wrong ideologically. This presumption of ideological (or political) infallibility carries with it the erroneous perspective of one’s partisan stance representing a whole (i.e., truth) rather than being partial, as with respect certain values being privileged above others.
The full essay is at "Church Billboards"