If the Jewish People Are Israelites (From Iacob) Why Do They Reject The Messiah?

First of all Jesus said no one can come to him unless the Father draw them and second Jesus did not come the first time to set up the messianic age but to regather the lost sheep of Israel from the world because they have lost their identities when they were scattered in 722 BC. The lost sheep are the lost 10 tribes and those christians that are friendly to Israel are actually Ephraimites. So when Jesus is finished in the office of Mashaic ben Yosef then he will come as Mashaich ben Daveed and set up the messianic age and that is when the 2 flocks will become one with one shepherd to lead them.