You can read about it here:
Hmmm ... doesn't the Bible say this about tattoos and cutting?
Ye shall not make any cuttings in your flesh for the dead, nor print any marks upon you: I am the Lord.
Leviticus 19:28 KJV
To be a Jew means to follow the law. The people in Israel are NOT following the law, so maybe they are not actually Jews.
Perhaps that is why their Messiah has not appeared.