All of Christianity rests on the foundation of the Resurrection. What proof is there?
Well, there is this: All of the apostles had the chance to save their lives if only they would disavow their belief in Jesus, and none of them did. Even to THEM, the Resurrection was the "exclamation point" on Christ's teachings. How many historical religious leaders inspired this sort of insane loyalty? The answer is approximately zero.
The person we now call "Jesus Christ" was born, lived, and died an Orthodox Jew, as were the Apostles. Consider that, as important as He was to them, they wouldn't even go to the site of his interment on the Sabbath, but waited until sunrise on the day after the Sabbath, because of jewish laws. These were believing, practicing jews.
Regardless of whether Jesus was the promised leader (use whatever term you like), it is clear theologically that Judaism is an incomplete belief system. It has no formal teaching on the afterlife, or what will result from a life of virtue as contrasted with a live of evil. Incomplete. Unsatisfactory.
Believe what you want to believe. The jews have traditions and mountains of philosophy to refer to. But it is still unfinished.