This entire op-Ed is great but this part stood out:
Extreme inequality is already contributing mightily to political and other forms of polarization in the U.S. And it is a major force undermining the idea that as citizens we should try to face the nation’s problems, economic and otherwise, in a reasonably united fashion. When so many people are tumbling toward the bottom, the tendency is to fight among each other for increasingly scarce resources
The idea with class warfare is to keep the lower classes arguing with each other so they don’t notice they are being screwed over by the rich, my belief is religion is a huge part of how this is done and is naturally divisive. Too bad no one seems to notice this.