When I read this, it reminded me of the idea that Adam and the Genesis account is centered on the ancestors of Israel and their immediate neighbors, and perhaps does not have the same application to the people of Australia and South American natives, until that time that the headship of Adam and Abraham was applied to all, and as expressed in Galatians, all those of faith became children of Abraham, and thus now fall under the headship of Adam if your interpretation leads you that way. That would be of course a spiritual rather than genetic or even genealogical connection, but is consistent with how the Bible uses the connection in Galatians3:
7 Understand, then, that those who have faith are children of Abraham. 8 Scripture foresaw that God would justify the Gentiles by faith, and announced the gospel in advance to Abraham: “All nations will be blessed through you.”[d] 9 So those who rely on faith are blessed along with Abraham, the man of faith.
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