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דניאל יוסף בן מאיר הירש
Perhaps the distinction is not whether Judaism is or is not correct.If "Judaism is following the correct God" then one has to wonder why for 2,000 years
the Jews were outcast from Israel and subjected to unprecedented persecution?
According to the story, being outcast and persecuted is a result of not following the law. The fault could be in how the people behave and not the religion itself.
But to the larger point:
It seems to me that a lot of the scriptural evidence provided by Christians to show Jesus as the messiah of the Old Testament requires that the individual believe in Jesus first. For example, the list of verses provided from Isaiah are not meaningful unless a person believes in Jesus. If they do, then the verses confirm that belief. But to an outsider, they are not convincing. The same is true for virtually all scriptural evidence that Jesus is the messiah that is alluded to in the Old Testament.