It can be proven He is the Messiah using logic and some knowledge of human nature. Books have been written on the topic.<quoted text>
People chose and continue to choose on what to believe.
Yes - Judaism does not believe Jesus was the "Messiah".
Whether or not he was an actual "messiah" has never been determined.
IMO - Jesus never actually stated he was any religion's messiah, but did state much about how the Spirit lives after we die, and his message should be accepted. Some folks took it to the extrememand consider him to be that "Messiah" that has yet to arrive for Judaism.
I believe one is called Jesus Christ Messiah or Madman. Here's a short clip: