Jealous Israel?

[Old Lion]

What is the Jewish people to be jealous of enough to make them want Christ? I'm referring to Romans 11:11  I say then, have they stumbled that they should fall? Certainly not! But through their fall, to provoke them to jealousy, salvation has come to the Gentiles.                                                    Is it what we have in Christ? Is it the New Covenant? Could be the fact that they will "left behind" It is difficult to see considering the current state of the church being largely apostate... (my opinion). Thank you in advance for those who contribute, The Old Lion