As I understand it, both Adam and Avraham had direct communication with God. Did Adam's communication with God make him Jewish? If not, what is the difference between the belief system of the descendants of Adam and those of Avraham?
Plan A was that there was not supposed to be a need for a Jewish people at all.
Adam was supposed to pass the test of jealousy, lust, and honor and that would have been it.
He failed at all three. then humanity as a whole was given three chances to rectify these three.
they failed at all three.
Plan B, now it's no longer all of humanity that rectifies the sin of adam but a small group within humanity - the descendants of Abraham, Isaac, and Jacod, each of which represents the rectification of one of the three flaws.
source lecture by Rabbi Uziel Milevsky