I agree, but I think an alternative perspective is required: politics is currently based on beliefs--and feelings: both of those beget 'us' (those who share any of them) vs. 'them' (those who do not).

For starters, everyone must understand that all beliefs and feelings are perfectly valid for those who share them, but of no consequence whatsoever for any one else. Ideally, people would focus on the first of those conditions regarding the beliefs/feelings of others and the second condition regarding their own beliefs and feelings.

Beyond that, an ethic of justice for governing the governance of society that did not involve any belief would be a great advance for humanity--though to get people to abandon beliefs/feelings for rationality is the longest of shots. On the other hand, that ethic (mutual respect) does follow from a belief in equality.