this was because of NT affirmation of genesis

You've got me intriged there, pete. I'm not sure where in the New Testament Genesis is specifically affirmed, as distinct from the Torah and other writings. The nearest I can think of is the start of Matthew (which as you will know but others may not) traces the geneology of Joseph from Abraham, but Abraham is far later in Genesis than the accounts of the creation and the flood and there is no attempt to trace Joseph back to Adam, for example.

Is that what you mean?