Seriously Dating someone outside of your religion/race

[decadence]

What's Chabad?
And do I understand it correctly that a Jewish person (aka a Jew - is that correct + inoffensive??) is someone who practices the religion judaism? In Israel, is judaism the primary religion (like catholicism in Italy say?)?
I'm confused about it - race/religion/culture (?) and don't know any Jewish people so thought I'd ask. Only way to learn .

Thanks!
Richard