American Christianity suffers from the legacy of de facto establishment of Protestant Christian religion. The lack of official establishment has made it harder for Christians to understand themselves apart from the posturing of American political factions and parties.
The pattern of poor discernment between American political propaganda and Christian faith has only worsened now that the de facto establishment of Protestantism is waning.
Christians demonize each other so easily because they don't know how to imagine themselves primarily as Christian persons in communion instead of citizens in a fractious state. What claims our imagination of our bodies and daily lives, sets the narrative for how we relate.