If only. But we can never become a Jew. Only the children of Jewish mothers are Jews.
A Christian who converts to Judaism is not considered a Jew in the same way that someone who is born Jewish is. Instead, they are referred to as a proselyte or convert. The distinction is important in Jewish law and tradition.
Otherwise... Thinking about the Khazar's imagine if that would be repeated but this time all of the White race would convert at the same time
We would outnumber them 50 to 1