The following essay sums it up pretty well:<p><a href="http:&#x2F;&#x2F;slatestarcodex.com&#x2F;2014&#x2F;09&#x2F;30&#x2F;i-can-tolerate-anything-except-the-outgroup&#x2F;" rel="nofollow">http:&#x2F;&#x2F;slatestarcodex.com&#x2F;2014&#x2F;09&#x2F;30&#x2F;i-can-tolerate-anything...</a><p>Long story short, Christians are &quot;red tribe&quot;, and most other religions can be thought of as &quot;blue tribe&quot;.