There are about a thousand different issues that need to be thought through in the texts of the first five books of the Bible, and they start popping up from the very first verse. Christians in particular can have a really difficult time going through the Old Testament because we are exceedingly unaccustomed to the kind of literature it has - narrative, not didactic material.We try to get the text to answer the question "how does this apply to me?" and can get into some knots, jumping over flaming hoops backwards to try and get an "application." That's not to say there is no application question to be asked - it is simply going to be found in a manner quite different to how one would find "what St Paul is telling us," were we to read a Pauline epistle.
The Pentateuch, the first five books of the Bible are traditionally ascribed to Moses, although scholars mostly agree now that this idea of authorship is somewhat outdated , and other theories have taken its place. The most prominent of these is a four-source theory, that says that the Pentateuch is made up of four sources labelled J, E, P, and D. I do not speak ancient Hebrew (in any of its forms), I am not a Hebrew Bible scholar, and so I cannot truly comment on the merits of this theory. Nonetheless, I wish to point out that the final editors of these texts (according to one version of the theory, the writers of the priestly source were the ultimate redactors) had a theological point to make, and that these texts do not read as a poorly made collage of different sources. Instead of trying to pick apart which source is which, it is of far more benefit to Christians to understand the richly textured world of the final product - all the while understanding that there is not one author. This point is readily understood, since we are accustomed to saying things like "John and Paul use that word differently" or "James means something different by 'justified'" - we know that words can be built up to have different meanings in materials from different authors, and it is this point I wish to emphasize from the JEPD theory. We will understand the text differently -ultimately, more fully - if we grasp that passages where the Hebrew word "YHWH" denotes God, and others where it is "Elohim" that is used for him, really do have a subtly different focus. Yet although we distinguish between Paul and John, Matthew and Luke, and all the rest of them, we Christians ought not fall into the trap of saying "I am a Pauline Christian", or others "I am a Johannine Christian", or even "I am a Jesus Christian" (meaning they adhere strongly to one or more of the gospel accounts, or epistles). To do so would be to have picked apart the Bible too much for any spiritual use. Such a fragmented Bible may be of interest to the scholars, but to the Christian, it profits little.
So those two vital points must be made before considering the Old Testament, but the Pentateuch in particular - that it is of a genre largely unused in the New Testament, and that, for the Pentateuch, one person's pen did not write the whole. One last point which seems at times forgotten is that these books are written in a historical and cultural context which is entirely different to ours. Some of the ideas which to them appeared self-evident will be exceedingly difficult for us to grasp, their questions will be totally distinct to those we might ask. So the last point is this: we must ask the text what information it wishes to convey, and not demand it tell us what it does not contain. To do so, we ought to consider the audience, the culture, the time and the place of its writing. Armed with these preliminaries, we may now go on to Genesis.
 Not to say all old things are wrong, which seems to be the implication of this expression. I mean simply that uniquely Mosaic authorship is the traditionally held dogma which is now viewed with as having a certain naïveté these days, now that we know significantly more. This still does not rule out Mosaic authorship, particularly as it is sometimes seen as heroic to doubt religious things which rest on much stronger evidence than more secular beliefs.