because the Jews were expecting the Messiah to come with pomp and glory and the salvation they expected was one which was earthy, as in restoring the kingdom of the Jews to one with the magnitude of Solomon's glory.
Instead God sent His Son to be born of a virgin, in a manger, earn His living as a carpenter, become an itinerant preacher, and finally suffer the ignoble humiliating death of crucifixion in the hands of those whom the Jews expected the Messiah to overthrow.
And where in the world did you get the idea that Jews want the world to believe in Jesus ?
They're just a little better than Sharia muslims in that you can bring in the Bible freely, but try proselytizing a Jew, in Israel, and you'll find out exactly what they think of Christ, Christianity, and Christians. And I'm not talking of the average Jew on the street. I'm talking about their government, from what I gathered from Christian friends who've been there.