I am still searching for the fuck up. There was nothing unusual or wrong that you did OP. If you sharing your factual knowledge offended them then you should also be offended by their sharing of their fictional knowledge. IMHO there is no better fun than to pick up a verbal fight with a religious fanatic (if the person has some sort of logic and sense in them), the most fun is to watch them fall into their own logical grave that they keep on digging by their own previous logics. But anyhow, the idea is not to have fun always but I have seen people started to actually understand and question their own belief and the propaganda religious texts once they have been through some sort of rational thought process and that brings joy to me and I am not at all ashamed of it and I feel no-one should be either.