Man sinned in the garden of Eden and sin entered the world.
From that point a saviour was needed. So, no matter what Isreal did Jesus still would have come.
And, in case it's your next question, Adam and Eve had a choice......God tod them not to eat from the tree of knowledge of good and evil...... They chose to eat it.
From that point we are born in sin. No one can be "good enough"
Christ was prophesied before Isreal existed ......... in Genisis
The first hint in the Old Testament that the coming Christ would be born of a virgin occurs right at the beginning.
And I will put enmity between thee and the woman, and between thy seed and her seed: it shall bruise thy head, and thou shalt bruise his heel.
Genesis 3:15
This prophecy, known as the Protevangelium, comes from the most ancient oracle known to man—the oracle that the Lord pronounced when He found our first parents, Adam and Eve, guilty of sin. The Lord is speaking to Satan, who has enticed "the woman," Eve, into disobeying the Lord's command against eating fruit from the Tree of the Knowledge of Good and Evil. He is saying that Satan will someday be crushed and utterly defeated by the seed of the woman.
The pronoun used to designate the seed is "his" (in "his heel"). In place of "it" (in "it shall bruise"), the more accurate translation is "he" (1). Therefore, the coming conqueror must be a single man. But why is He called the seed of a woman? A child is ordinarily regarded as the seed of his father and forefathers. The striking and unnatural character of the expression "her seed" suggests that it is a uniquely fitting name for the victor over Satan. Unlike other men, He would be the seed of a woman only. He would not be a man's seed. A virgin would conceive Him without losing her virginity.
