It's complicated. Jewish is a religion as well as an ethnicity.
The much-before-CE cult turned into a religion turned into one of the longest running breeding experiments we have. The historical focus on internal tribal mating self-selected certain superpowers (e.g. http://en.wikipedia.org/wiki/Ashkenazi_Jewish_intelligence) that come in quite handy these days.
The much-before-CE cult turned into a religion turned into one of the longest running breeding experiments we have. The historical focus on internal tribal mating self-selected certain superpowers (e.g. http://en.wikipedia.org/wiki/Ashkenazi_Jewish_intelligence) that come in quite handy these days.