>>But Jews believe in the promise of Christ, but they are still waiting.
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>But the difference, If I understood him correctly, is that if Adam, Eve or Moses were alive when Christ came, then they would've believed in Him as the Messiah (of course is arguable, but I think is understandable to believe so, otherwise Christians would have ditched the old testament if the main characters were not truly believers

Then the Jews haven't ditched the old Testament (the Torah), and they believe that Adam, Eve and Moses would not have chosen Christ. In otherwords, each believe that those characters would have chosen, as they have chosen. One or both are wrong.