Ask a Christian, “How do you view sin?” and he will immediately discuss matters pertaining to moral implications and ethical values. Ask a Jewish woman, “How do you view sin?” and she identifies quickly sin as being the actions that which you either do or don't do in relationship to the standards that are already established in the code of ethics, Torah. This very same word has two completely different meanings.
At the end of the conversation, which will you decide? Will you side with the notion that sin is dependent upon whatever enters your thoughts and what you perceive with your feelings? Or, will you reason that sin is something that is tangible and observable? Ultimately, the choice is yours to make.
When a Christian asks a Jew, "Do you believe in Christ?" it's like the moon is about to crash with the earth. When these two different views are compared side by side, the Christian perspective of Christ is quite different to the Jewish perspective of Messiah. To add, the Jewish perspective of the Christian Christ is insulting to the Christian faithful while Christians remained baffled with the Jewish perspective of Messiah.
Christians really don't define Christ. To define Christ, they feel as if though they're excluding the topic of many doctrinal foundations that has developed within the course of recent human history, especially the Protestant Reformation. Jews, on the other hand, do define Messiah and do not have a problem talking about a very Jewish one.
At the end of the conversation, is it Christ or Messiah? More importantly, what's the difference? Though both groups use similar terms, these words mean totally different things! Could there ever be a resolve to the existing difference? Only if both groups hold true to the same definition, and both sides are not willing to give up the grasp on their views so easily.
When a Christian tells a Jew, "You need to repent," the Jew immediately thinks, "I need to return to the ways of Elohim as prescribed in Torah; I need to return the Promised Land and enjoy the inheritance that Elohim has endowed my people."
If a Jew was to tell a Christian, "You need to repent," the Christian immediately thinks, "I'm a sinner. I need to change my way of thinking and feelings towards G-d; however, I hope this Jew doesn't think I need to convert to his religion."
Why the difference?
Though both groups use the exact same word, this one word mean two totally different things! Could there ever be a resolve to the existing difference? Only if both groups hold true to the same definition of the term of repentance, and both sides are not willing to give up the grasp on their views.