Israel has been judicially blinded (Romans 11:7,8) but only "in part." Only "some of the branches be broken off" (Romans 11:17). Through every year in this age of the church, there has been "a remnant according to the election of grace" (Romans 11:5). Many Christian leaders, beginning with the apostles, have been Jews.

Source:

KJV Defenders Study Bible, by Dr. Henry Morris, Ph.D.
Publisher: Thomas Nelson
Language: English
DEF 10 ISBN 0-529-10444-x
DEF 10-1 ISBN 0-529-10445-8