It is traditional to think of the twelve tribes mentioned in the Revelation as being flesh Jews. But we forget that the Jews as we know them today were only ever one tribe themselves (the tribe of Judah). The other tribes of Israel were wiped out even before Jesus was born. (Note: Even the names of the tribes in The Revelation are different from those of the Old Testament. Compare Exodus 1:2-7 with Revelation 7:4-8 and you will see that the tribe of Dan has been replaced by the tribe of Manasseh.)
What the twelve tribes of prophecy represent are "God's people". His people are not, by any stretch of the imagination, those who have rejected his Son. His people are those who have accepted his Son... those who follow Jesus (the Lamb) humbly wherever he leads, just as the Bible says. (Revelation 14:3- 4)
Institutional Christianity's obsession with the Jewish race is a reflection of her own rejection of the message that Jesus came to deliver. God's goal is not to build a nation of people who possess Abraham's genes, but rather to build a nation of people who possess Abraham's faith.
The Revelation refers most consistently to Jesus as "The Lamb", in order to contrast his followers with those who seek a Temple made with hands (Acts 7:48) in which to sacrifice other lambs. Spiritual Jews have no need of a visible temple, while flesh Jews have no higher hope.