I don't really think that is the problem here. It's more a matter of you accept the God of the OT as authentic or you don't. And if you do not, then you cannot simultaneously entertain biblical fundamentalism, unless you are willing to simply gloss over the most jarring possible contradictions, which by and large much of Christianity has been exactly willing to do for millennia. The alternative is to take a more nuanced view that the OT as a document is a human interpretation of the Hebrews understanding of their historical experience. But to do that undercuts the authority of clergy to mediate the interpretation of the infallible text, so the theologians of fundamentalism wave away the inherent contradictions and continue to argue infallibility because it is the key to their power.
Now clearly there is another Christianity that has a completely different approach to all of this, but they have been a shrinking minority and American Fundamentalists pretty much view those people as mushy headed apostates.