The last sentence is the key. Those who choose birthright already are at least somewhat predisposed toward Jewish identity. To have a bit more valuable study one would have to interview them and measure them before birthright, and then test them much later and see to what extent they have affiliated with judaism and the Jewish people vs a control group.
Jordan foreign minister says to speak with Kerry on Israel-Palestinian conflict (Reuters)
from the article: More Birthright grads are marrying in, says new study
An American playwright has penned a gripping tale about an Israeli Arab killed in the October 2000 events — and his steadfast sister.02:58 02.05.16 | 0 comments