the question you should be asking is why did he have to overcome the world he created? the question you asked is the easiest to answer: there was an established historical written record of prophecies and by fulfilling them, he would prove to those around him that he was in contact with the father and had the divine within him. there can be no doubt he was the jewish messiah, as so many christians died to stop hitler who would have extincted the entire race if allowed to continue. this is not a debatable point, it is factual truth. without jesus, there is no jewish race in existence today-- meaning there could be no other messiah. some of you may not like it, but this is what peak messiah or savior looks like.  and as and aside, incarnate is much like a download from outside our containment box. the dove from above might come for you one day too. so turn your frown upside down, lest god chose you to be made an example of as well. as you get older you will see what happens to those who lie and hate and realize something quite profound.
Canada