If I cannot convince to look up Jewish matrilinearity, then I suppose that I cannot convince you of anything else in the universe. You see, this is yet again that the anti Catholics spurn not only Almighty God, but also the realities of this world.
I thought the discussion had to do with the sin nature coming from the father and not about "Jewishness". Scripture says, as Metmom pointed out, that sin came from Adam and because of Adam's sin we are all sinners. This doctrine is quite different from the one about Jesus' lineage going back to the throne of David. We had this discussion back some time ago, and we know that both Mary and Joseph can trace back to David's lineage but only Mary's side was without a curse (Jeconiah) so that Jesus was legally entitled to the throne of David.