To raise the dead, or raise oneself from the dead is a demonstration of supernatural power that would certainly legitimize someone claiming to be God.  And so Jesus did - Jairus's daughter, the son of the widow of Nain, and finally Lazarus. But Jesus wasn't the only biblical person to raise people back to life. Prophets and apostles before and after Him were able to do that.  What would set him apart from the others who could do that?  How about if he dared his enemies to kill him, and then promised that He would come back to life in 3 days?  That is exactly what he did.