According to an article on by Joel Rosenberg, on All Israel website, it is estimated that there are approximately one million Jews around the world who have become Christians by putting their faith in Christ.
This is based on a study by Lifeway, that found there are approximately 871,000 people of Jewish descent in America who believe Jesus is the Jewish Messiah.
In addition, a study by Dr. Erez Soref, Israel College of the Bible, estimates there are about 30,000 Messianic Jews living in Israel. This puts the number of Messianic Jews in these two countries at around 900,000.
According to World Population Review (WPR), there are approximately 15 million Jews worldwide, though some estimate the number could be over 17 million.
The disagreement on the size of the Jewish population stems from how a person defines a Jew, which is traditionally determined by being born to a Jewish mother.
In 2022, WPR reports there are 6.8 million Jews living in Israel and 5.7 million living in the US, but WPR notes on its website that other sources say the American population could be as high as 6.7 million.
This is followed by France with 450,000 Jews, Canada with 392,000 and the United Kingdom with 292,000.
With 900,000 born-again Jews in Israel and the US, Rosenberg estimates there are one million Jews worldwide who accept Jesus as their Messiah.
Depending on what number you accept as the size of the Jewish population, this means that roughly 6% to 7% are believers.