A lot of modern Christianity is borderline Marcionite in how they handle the OT. Thats a fair observation.
That being said, I think a lot of it comes from ignorance of the OT and the idea that Christianity is a new religion rather than a continuity of a first century Judaism. The NT is a commentary on and application of the Torah. The gospel preaching of Christ is all about the Torah. His disputes with the Pharisees are about interpreting and applying the Torah. The preaching of Christ is the Torah. You can't read a disjunction back into it.
But, that is evidence itself that the Torah can be abused and misunderstood even with the best of intentions. And especially with the worst.
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I'm also curious why an omnipotent being needed a bloody and brutal sacrifice( willing or otherwise) to save its followers from...well itself. Why did it require murder, torture etc?
I think this is a modern question that presumes a modern and incorrect understanding of the word "sacrifice". Ancient sacrifices were not about torture, or blood, or even death per se. Death was incidental to animal sacrifice and not ritualized. The common thing with sacrifice is hospitality, particularly food. They are offerings, but the "value" is in the offering, not the death. Killing and butchering is how you make an animal into food.
God did not "require" murder, and torture. Jesus came to show the nature of God, and the true nature of Humanity in Himself. Accepting that death was the fulfillment of the prophecy to Abraham. It was also to show us what love and humility looks like. The icon we have of Christ wearing the crown of thorns is called the bridegroom, and extreme humility.
But why death? Because in dying, Jesus destroyed the power of death over human nature. He laid down His life willingly - no one took it from Him. This is why we sing, over and over again, "Christ is Risen from the dead, trampling down death by death, and upon those in the tombs bestowing life".
I do think that modern Christianity's understanding and explanation of all of this is muddled.