I mean yeah, this is what happens when you try to reconcile a collection of texts compiled over several centuries by dozens of authors holding differing moral codes into an eternal tome of reference for ethical behaviour....
You're having trouble reconciling the Old Testament with the New?! I didn't even know there were "problems" needing to be reconciled. Nor do I see the authors holding "differing moral codes". All the writers of the Old Testament (expect possibly Job, which
may have been written before Moses), lived under the same moral code (the Law of Moses). And the New Testament establishes a new covenant enabling men to fulfill the spirit of the Law of Moses without all the exterior/ceremonial clutter (clutter put in place that pointed to the Messiah).
You'd be better off just saying, "I don't believe the bible", than using a silly uneducated argument as an excuse. Jesus and the writers of the New Testament had no problem "reconciling" the Old and New.