One of my fav. "smart atheist" takes is to point out the constant heresies of self-proclaimed Christians in the US.
Yes, just about every church in the US is heretical to the core, not that there's anything wrong with that. Expecting them to follow any sort of orthodoxy is dumb.
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"They don't even know their scripture," he gloats, ignoring that Christians have been killing each other over differing views on scripture since antiquity itself.