Jesus paid the price for our crimes and so in order to be saved one must repent and stop sinning.If the Pharisees had accepted Christ as the Messiah, during Christ's ministry or the Acts period, the nation of Israel would have accepted Him, and the New Heavens and Earth would now be about 1000 years old.
Like everyone else, the so-called Jews today must believe in Jesus Christ, in order to be saved.
God foretold that the Jews would crucify the Messiah. And so if the Jews had accepted Jesus Christ then God would be a liar.
You see Jesus had to die and spill His blood... else who would pay the price for our crimes ?