Is Jewish a race or religion? Before we just say religion, consider this. Jews (especially American Jews) have a "certain look" right? It's in their eyes, nose and mouth configuration. There is often times a real "Jewish" look. Right?
Nope. That's absolutely wrong. There is no such thing as a 'Jewish Look'. There is no such thing as 'Jewish Blood'.
According to Jewish Law, if you were born to a Jewish mother, you are Jewish, if you practice the religion or if you don't.
If you convert to Judaism, which is a long and difficult process, you are 100% Jewish.
Jews could be considered an ethnicity because of the commonality of culture and traditions. However, many different Jewish groups have some very different traditions.