When the Founders of this country sought to keep politics and religion at arm's length, it was because they not only recognized that joining the church and the state corrupted the state, but that it corrupted the church as well. When religious institutions take partisan sides they tend to become enamored with power, and to throw aside all that they claim to believe in with their efforts at maintaining their hold on position and influence. 

The Founders could point to no less a source than the Gospels and their stories of the Pharisees for a perfect example of this. We can point to today's religious "leaders" who have sacrificed their beliefs to rally around Trump as modern day Pharisees.  No less corrupt, no less hypocritical, no less ostentatious and no less dangerous to the nation and to the religion they presumably seek to defend. 

History repeats because too many keep thinking its lessons don't apply to the latest generation.