John 1:12
Yet to all who received him, to those who believed in his name, he gave the right to become children of God.
There were plenty of Jews who welcomed the promised Messiah. When He entered Jerusalem, large crowed acknowledge that He was the divine Son of God. The Messianic Jews 2.000 years ago believed in His name, the most powerful name you can ever take on your lips. The Hebrew words «believe» includes the English expression of obeying, relaying, and trusting. Those are the true children of God.
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http://www.judaismvschristianity.com/how_the_name.htm
ow the true Hebrew Messiah name got changed