"And if you don't understand the difference between a man murdering a captive for divination or good fortune (as was the Druidic practice) and the self-sacrifice of a loving God to redeem said man, you haven't the theological or philosophical discernment to continue this conversation."
Didn't God toy with Abraham in his attempt to make Abraham sacrifice his son (by Sarah, not the firstborn of the concubine)?
You have read the rest of the story, haven't you?
Nope. Pay careful attention to the passage in question, and you'll see that Abraham was acting out prophecy. Two thousand years later, probably on that exact same spot, another Father sacrificed His Son--and this time, there wasn't anyone higher who could provide a substitute as God did for Abraham.
Furthermore, Abraham knew that he was acting out prophecy, which is why he named the place Yehoveh Yirah, or "The Lord Will Provide," and said, "In the Mount of the Lord it shall be provided." (Gen. 22:14) He also trusted God's promise that through Isaac he would have a great nation come out of him that he could be confident that even if he went through with the sacrifice, that just meant that God would raise Isaac from the dead (Heb. 11:17-19).