That's what I thought; that it must be historical difference and that it's NOW that they consider someone jewish only if their mother was jewish. But I mean, why would they change that? No matter what, the person will be half jewish even if the mother is jewish but the father is not, genetically speaking and therefore shouldn't make any difference.
And yes, Ruth was a Moabite. And the Moabites were related to the Jewish people. But so was Job. He was a Chaldean but he's not considered Jewish.
justahuman - but super nonetheless