The author of that article who kept looking for reasons to be offended bluntly dismisses the Church's endorsement of slavery because it was standard practice at

The author of that article who kept looking for reasons to be offended bluntly dismisses the Church's endorsement of slavery because it was standard practice at the time while also basically calling Twain a bigot because of his southern American-based view of Catholicism, which was also standard practice at the time. You and the author both act both bigoted and ignorant towards Twain and call him childish in response to perceived bigotry. Twain was also not an atheist, he was a deist who attended church regularly. Someone can be of a religion and also criticize religion, it doesn't mean they're an atheist because as we all know, religions aren't perfect. But at least to the author's credit, he took a bit higher road than you and didn't go as far as calling Twain "childish".