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. Now if their fall is riches for the world, and their failure riches for the Gentiles, how much more their fullness! – Romans 11:11-12

So many Christians are being provoked to jealousy of Israel, rather than provoking Israel to jealousy of the salvation they have found in Jesus Christ, the Messiah.