superpunk,
You may not realize it ( or perhaps you do) but not everyone believes in the "bible" God.
The OT God is simply ONE version of what SOME people Believed God to be, that is why that God seems at odds with the NT God in some people's view.
As it has been said, IF the OT scribes and the Old Covenant had been "right" there would h ave been NO NEED for God to "send" His Son.
As a Christian that found God through Jesus OUTSIDE the bible and started to study the bible AFTER the fact, I ( and I speak soley for myself) saw the reason God needed to send his Son to "straighten" people out.
The view of a cruel, uncaring, punishing God ( as seen in the OT at times) is one that I do not and can not reconcile with My heavenly Father, maybe because I relate to God VIA Jesus, actually...no myabe's about it, it is because I relate to God Via Jesus.
DO I believe in the God of the OT? the bringer of death, destruction, genocide, mutilation and so forth?
Nope.