I must confess a certain guilty pleasure in reading Jerry B. Jenkin's and Tim LaHaye's Left Behind series. They have a faced paced comic book feel and are subtly anti-Catholic, hence the guilty pleasure. One must remember they are fiction, although the authors believe the books have catechetical value. Here is one of their theological nuggets from the second book in the series:
The very first qualification of Messiah…is that he should be born the seed of a woman, not the seed of a man like all other human beings. We know now that women do not possess seed. The man provides the seed for the woman’s egg, and so this must be a supernatural birth…Our Messiah must be born of a woman and not of a man because he must be righteous. All other humans are born of the seed of their father, and thus the sinful seed of Adam has been passed on to them, not so with the Messiah born of a virgin.
Seed or no seed, we know 50% of the genetic material for the newly conceived human being comes from the woman. By that logic, wouldn’t she also need to be free from the sinful seed of Adam? It sounds like a compelling argument for the Immaculate Conception, but I doubt the authors see it that way.