Pew Jumpers, Camel Balls, and My Atheist Father’s God

I was raised by Pentecostals, atheists, Baptists, Muslims, and more than a few accidental philosophers. Somehow, nobody taught me to hate the other side.
Now I watch neighbors, churches, and communities divide themselves into "us" and "them," and I can't help but wonder: when did faith become more about identifying enemies than loving neighbors?