Also, this is just my opinion, but I think the OT/NT moral theology distinction is overplayed to the point of frequent disingenuousness and typically used (by Christians) in the service of terrible "dispensationalist" (at best) theology or (by non-Christians) in the service of an attempt to maintain a high view of Jesus that I don't think a secular worldview should really be expected to support. There are numerous passages of overflowing mercy and benevolence in the Hebrew Bible and not a few passages of terrifying harshness and judgment in the Gospels.
The root of this is, as I'm guessing you know but not everyone here will, 19th century intellectual antisemitism.
