He [God] hates our sin so much that only bloodshed can atone for it.
Answers the qeustion:
Please explain how suffereing "pays" for anything, and why God is so eager to accept "pain" as a payment.
Now, you may be right, "That's basic Christian theology -- if you don't understand it, then you have no grasp of Christianity," even though I have studied "Christian theology," for over forty years," but, if the above is your answer to the question asked, you have no grasp of simple logic, because it does not answer anything at all.
I suggest you look at MarMema's excellent post here and the link provided. I assure you, MarMema is an excellent student of theology.
Hank
Oh come now. Your credibility will decline even more quickly here if you persist in these kinds of statements.