It's a useless discussion. Every Christian pick and choose what they want to believe out of the OT or the NT. Even fundamentalist do too but find ways to justify out the ugly bits. 

Here's the key question. What's something contained in the OT or NT about morality or ethics that you wouldn't otherwise have known  if you didn't have it available???? What's something that only fundamentalist would do purely becauase it's justified in the OT and NT?