I'll tell ya why, al....It was dreamt up by the Demiurge dwelling inside some ancient Hebrew's head....where all Demiurgic distortions of Divinity come from.
Also, most of the OT was written during or after The Babylonian Exile (either the exiled Hebrews forgot their history & sacred texts or they rebooted/made-up the whole faith to make them more 'badass'...hence all that genocidal crap) and the events of the Torah are NOT historical (ask any archeologist).
So, a highly-enlightened spiritual master/guru Jewish guy from Galilee came along, realized all this silliness that plagued his beloved Jewish faith & decided to give the Jewish faith another reboot, removing the "raging deity/demiurge/khorne expy/bigoted" stuff and making it a gentler, universalist faith for everyone. He may have given some props to the OT but only the parts that were still valid but still...reboot time.
Thus The Way or the Nazarene Path was born, the original "Reform Judaism". A necessary re-boot with it's own Moses/Aaron (Jesus), Elijah/Elisha (John The Baptist) & Twelve Patriarchs/Tribes (The Twelve Apostles). Thus Nazarene Judaism (Later to be called 'Christianity') was born!
But then the Romans got a hold of it, turned it into a separate religion, declaring the whole OT valid again while paradoxically vilifying the folks who wrote the OT and turned it into a raging demiurgic mess with peace-loving Nazarene-dressing. Christianity is a kind, peaceful, loving faith but the OT being thrown in is the "spanner in the works", hence, pogroms, inquisitions & jerks like you, al.
Actually this is little more than a round-about way to tell you, al, that you are a murderous, homophobic Demiurge-kissing Archon. You are bad & you should feel bad....and jump into a volcano.