[count-your-change]

“Just where do you get that Jewishness is matrilineal? Which genealogies in the Bible support that?”

There are no genealogies in support of the idea. It comes from the interpretations of Deut. 7:1-5 made by Orthodox Jews.

But those verses are God’s command to remove certain peoples from the Promised Land and form no marriages with them. It says NOTHING about inheriting anything from anyone.
In short, “ Let me remind you that Jewishness is matrilinear.”, is a Talmudic invention.

[Judith Anne]

Jewishness has been matrilinear for millennnia; the exact origins of that are unclear, and have several biblical references. A discussion of this can be found at:

http://www.jewishfamilyservice.net/jewish-identity/why-does-jewish-identity-pass-through-the-mother-matrilineal-descent-if-the-tanakh-traces-descent-by-fathers