Lots and lots of Jews accepted Jesus as the Messiah. Jesus was a Jew. Paul was a Jew. There are still Jewish Christians.
"Jewish Christians, also Hebrew Christians or Judeo-Christians, were the original members of the Jewish movement that later became Christianity.[1] In the earliest stage the community was made up of all those Jews who accepted Jesus as a venerable person or even the Messiah, and was thus equivalent to all Christians.[1]"
"Jewish Christianity, initially strengthened despite persecution by Jerusalem Temple officials, fell into decline during the Jewish-Roman wars (66-135) and the growing anti-Judaism perhaps best personified by Marcion (c. 150)."
Jewish Christian - Wikipedia the free encyclopedia
However, most Jews rejected Jesus as the Messiah, which is why Christians found more fertile ground in non-Jewish regions.