- Mary was a young virgin at the time of the encounter
- Neither Joseph nor any other man (besides God) was involved in the encounter
- Whatever the experience, Mary could not endure it without being overshadowed by the Holy Ghost
- Jesus of Nazareth never spoke of how he was born, certainly never teaching the Virgin Birth doctrine himself
- Neither Paul nor any of the later New Testament writers said anything about the Virgin Birth
- The Book of Mormon prophets did not teach this doctrine
A even sillier argument exists, this being that because it is not directly stated how the conception of Mary took place, we cannot know how it happened. There would only be reason to describe the conception of Mary if it was radically different than the natural order, not if it was in line with it. The authors of scripture knew that their audience would understand the birth process, thus only the parts that are different than ours were mentioned.
There is one final matter I want to bring to this argument, but it does not have to do with Mary per se. In the miraculous births of Sarah and Elizabeth, God does not violate the natural order to bring about his purposes. Rather, the text says that both women were known by their husbands, and God took charge in making sure that conception happened. If he did not violate the natural order in these instances where the participants were well beyond the child-bearing years, there is no reason to believe that he did so with Mary, who was in the prime of her child-bearing years.