I think I've mentioned this before. The so called Christian Zionist movement is a comparatively modern think. Also so is the Jews for Christ movement. Having said that Christians have always been thoughtful for Israel. Paul the apostle himself said,
Brethren, my heart's desire and prayer to God for Israel is , that they might be saved. 2 For I bear them record that they have a zeal of God, but not according to knowledge. 3 For they being ignorant of God's righteousness, and going about to establish their own righteousness, have not submitted themselves unto the righteousness of God.
(Romans 10:1-3) and
For I could wish that myself were accursed from Christ for my brethren, my kinsmen according to the flesh:
(Romans 9:3)
So Christians feel that is is their duty to evangelise the Jews, who have rejected their own Messiah. Even one of their own prophets said
For Esaias saith , Lord, who hath believed our report? 17 So then faith cometh by hearing, and hearing by the word of God. 18 But I say , Have they not heard ? Yes verily, their sound went into all the earth, and their words unto the ends of the world. 19 But I say , Did not Israel know ? First Moses saith , I will provoke you to jealousy by them that are no people, and by a foolish nation I will anger you. 20 But Esaias is very bold , and saith , I was found of them that sought me not; I was made manifest unto them that asked not after me. 21 But to Israel he saith , All day long I have stretched forth my hands unto a disobedient and gainsaying people.
(Romans 10:16-21)
So I consider it the dudy of all Christians to preach the gospel to every creature and that means also to the Jews. For that is what we were commanded to do by Christ himself.
But this does not mean that we should fawn over them and take their side at the expense of justice and morality. History has demonstrated that they have disobeyed God again and again. The Christian must always stand up for that which is right, not just because they believe the Jews to be "God's people". For the apostle also says,
Not as though the word of God hath taken none effect . For they are not all Israel, which are of Israel:
(Romans 9:6) In other words not all Jews are chosen for salvation. Only those who obey the gospel by believing in the Messaiah. So in short Christians should not go all soppy and dewy eyed over the Jews.
"Then he answered and spake unto me, saying, This is the word of the LORD unto Zerubbabel, saying, Not by might, nor by power, but by my spirit, saith the LORD of hosts." (Zec 4:6)