Peter Enns argues that there was no historical Adam and Eve; rather these were ANE myths that were borrowed and repurposed by the post-exilic writers in order to describe the creation of the nation of Israel. He argues, rather unconvincingly, that the writers of the OT and NT, including Paul, did not believe in a historical Adam; and even if they did, they were simply mistaken by virtue of their premodern, unscientific worldview. Evolution, he says, has definitively disproved the possibility of all of humanity coming from one family. So rather than trying to fit Genesis 2-3 into an evolutionary framework, or advocating a creationist position, we need to abandon the historical Adam altogether.
I think that Enn's argument falls short on at least three fronts: (1) his claim that the Genesis account was written and compiled in post-exilic community, and not by Moses in the mid second millennium B.C., (2) that the ANE creation myths that Genesis allegedly borrows from never give an account for material creation, and (3) the assertion that the Biblical account is merely polemical and repurposed ANE creation myth.
The documentary hypothesis (JEDP) for the authorship of the Pentateuch has long been the view held by most modern critical scholars. Many OT scholars have refuted this view, such as T. Desmond Alexander and Gordon Wenham. In Enn's book, Inspiration and Incantation, he mentions how both the decalogue and the book of Deuteronomy are structured after ANE suzerain vassal treaties. Yet he failed to mention how they reflect a certain form of this covenant treaty, resembling Syro-Anatolian treaties of the fourteenth-thirteenth centuries B.C., and not of those nearly a millennium later that the post-exilic community would have been familiar with.
Both the ratification of the covenant at Mt. Sinai, and the second giving of the law-covenant to the second generation closely resemble the covenant treaties of the surrounding ANE communities. These contained (1) a preamble, (2) an historical prologue, (3) stipulations, (4) blessings and curses, and (5), covenant continuity (taken from Meredith G. Kline, The Structure of Biblical Authority, 113-130). You can see each of these elements in the giving of the law-covenant in Exodus 20, and, as Kline argues, in the entire structure of the book of Deuteronomy (Ibid., 133):
Preamble: Deut. 1:1-5.
Historical Prologue: Deut. 1:6-4:49.
Stipulations: Deut. 5-26.
Curses and Blessings or Covenant Ratification: Deut. 27-30.
Covenant Continuity: Deut. 31-34.
While there are still similarities between the structures of the treaties of the second and first millennium B.C., Kline says that the “most remarkable difference is that the historical prologue, the distinctive second sections of the second-millennium treaties, is no longer found in the latter text” (Ibid, 151). It is not likely that Israelites in the exile or even post-exilic communities would have been able to reproduce these complex ancient treaties from a millennia before their time. It is therefore far more likely that it was written during the time of the exodus by Moses.
Second, Enn's repeatedly claims that ANE creation myths never deal with an account of material origins. Prescientific people, he says, were not concerned with the origin of the universe; rather they were concerned with the origin of their God and their nation. This is a gross oversimplification of documents like the Enuma Elish or the Atrahasis Epic, and many others. While I agree that these particular creation myths are for the purpose of establishing both the nation and its national deity, it also serves as an account of material origins. More than that, one needs only read the Genesis account to understand that this a clear account of material origins. And, like the other creation stories, also serves to establish both Israel's history.
The primeval history of Genesis 1-11 serves as a prologue to the conferral of God's kingdom on Abraham through covenant, and later Israel. Hence its genealogical structure (Adam through Seth, Seth through Noah, Noah through Shem, Shem through Terah, Terah through Abraham, Abraham through Isaac, and Isaac through Israel). And it also serves to establish Israel's God, YHWH as the one true God, creator of heaven and earth. So, Genesis itself serves as historical prologue to the ratification of the Mosaic covenant at Mt. Sinai, once more reflecting the particular Hittite treaties of the mid-second millennium B.C. But it also gives a clear account for material origins, both visible and invisible (i.e. heavens and earth of Gen. 1:1). These two things need not be mutually exclusive as Enn's claims.
Last, Enn's oversimplifies the similarities between Genesis and the other ANE accounts but does not do a sufficient job showing the differences between them. Creation is not the result of a struggle between the gods but is the result of the one God, and His sovereign power. Man is not created to relieve the gods from their manual labor; rather they are endowed with God's image as his vice-regents, and are given the task of laboring, cultivating God's good world, and ushering it into the eschaton of consummate sabbath rest. There are certainly similarities, but the differences are most striking. For a fuller comparison, see John D. Currid, Against the Gods.
One thing I agree with Enn's about is that the Biblical creation account is not compatible with what many scientist believe concerning human origins. Any attempt, like John Walton's, in his The Lost World of Adam and Eve, to try to merge evolution and the Genesis narrative fall far short. That being said, there are many scientists from prestigious universities that deny the current theory of human origins. Enn's does not seem to acknowledge this fact, because it does not fit the narrative that evolution is a settled matter, and therefore we must rethink the doctrine of Biblical inerrancy. We must either affirm the historicity of Adam and Eve, and reject current prevailing models of human origins, or we must deny the Genesis account as myth. The implications of this view for inerrancy are startling, but even more, the implication of this view for the very person and work of Christ are cataclysmic.
If the first man Adam is not the progenitor of all mankind, then he cannot stand as federal head of mankind (Rom. 5:1-11). If he was not in a probationary covenant of works, whereby by perfect and perpetual obedience he would have merited eternal life, the second man, Jesus Christ has not merited eternal life for His people. If death is not the result of the fall, then death is a natural consequence of creation and “very good”, and the last man’s resurrection from the dead is of no avail in rescuing us from the misery of sin and death. If we have not bourn the image of the first man, the man of dust, then we will not bear the image of the last man, the man from heaven (1 Cor. 15:47-48). If the historical Adam and Eve are lost, then the very foundation of the gospel itself is lost. We must, therefore, hold fast to the Scriptures plain teaching on the humanity, and not capitulate to the spirit of the age, the spirit of unbelief.