What's the whole of Genesis about?
Jason Hood, over at the SAET blog, has some very sensible things to say about how the whole book speaks a message that needs to be heard by NT Christians, and what's more speaks it with great clarity:
His full post is not long and is well worth a read: http://www.saet-online.org/why-moses-wrote-genesis/09/
Here's a small extract to whet the appetite and send you to the full thing:
Moses wrote Genesis not just to inform Israel of their origins, but to get them to see that Canaan, not Egypt, was their homeland, and to give them guidance for life in the land as one big family under covenant with YHWH, with distant relatives around them and enemies among them.