If I were that poster I would not reply. If someone questions my motives in a case of an obvious [to me, anyway] typo I would just give it a pass. I extend the benefit of the doubt to my fellow conservatives here on FR. I don’t believe that expecting the same in return is asking too much.
In addition your obvious conclusion, may be incorrect. I prefer to know exactly whom I am talking to. I could care less if the person is an atheist, but knowing who you are talking to and their motivations are important.