Jesus was not considered to be historically significant by historians of his time because He did not address the Roman Senate, or write extensive Greek...
philosophical treatises; He never travelled outside of the regions of Palestine and was not a member of any known political party. He suffered the ultimate...
humiliation, both in the eyes of Jews and the Romans. Jesus never used the established "news organizations" of the day to spread His message. He travelled...
about avoiding for the most part the major urban centers of the day. Jesus lived an offensive lifestyle and alienated many people. He...
associated with the despised and rejected: Tax collectors, prostitutes, and the band of fishermen He had as disciples...
Does this seem like a reasonably possible explanation to you?
If the person asks where's the proof for God/Jesus/Christianity, go here.