As a Christian, there is a lot of the OT that I don't consider to be LITERAL - and neither do Jews for that matter, and it's as much or more their literary trove as it is ours.
I see it as imagery preceding Christ's sacrifice on the cross, the sacrifices at Passover, etc. I see it as a story illustrating the sorrow of a father/God the Father. I see it as illustrating our relief and thankfulness that a sacrifice was made FOR us rather than BY us.
I also see the OT as rudimentary, though it is full of truth and beauty. Sort of like this:
When a child is young, you tell them simply "Don't go out into the street," or "Don't ever touch the stove." Do you mean for them to NEVER, EVER go into the street, or touch a stove? No, of course not. Yes, you are the boss, yes, you are in charge, and yes, you said this and meant it at the time, but it was for THAT time in their lives and THAT particular level of maturity. YOU don't change your character - but they mature and gain more understanding, and those old commands, which were relevant and right at the time, lose their situational relevance.
Christianity/the NT is the further development of groundwork laid in the OT, in my opinion as a Christian. God continues to reveal His nature and character to man - from the earliest books (Job for instance, and the Pentateuch) thru the New Testament.