2 Kings 3:26-27 reads
26 When the king of Moab realized he was losing the battle, he and 700 swordsmen tried to break through and attack the king of Edom, but they failed. 27 So he took his firstborn son, who was to succeed him as king, and offered him up as a burnt sacrifice on the wall. There was an outburst of divine anger against Israel, so they broke off the attack and returned to their homeland. (NET)
If you were to read this naturally, even after vigorous examination of the surrounding texts, it would seem that this passage would creat a huge conundrum from a theological standpoint. What it suggests is that, by sacrificing his son, the king of Moab manages to call down the wrath of a very real god, who then proceeds to invoke his power onto the Israelites in a manner not dissimilar to the way God has supported his followers in previous and following chapters.
It was prophesied that God would hand over the Moabites to them in earlier chapters as well. As far as the rest of the story went before this, it seemed like a sure victory. But this deity actually managed to drive off the Chosen People even as they were being backed up by God to win this battle.
This raises a number of questions, the first and foremost being where in the world this "divine anger" is coming from. Is there really another god out there that we have only just heard of, and if so, shouldn't an omnipotent and omniscient God surely possess the means to keep him down and allow his people to triumph? And after this seeming defeat at the hands of Chemosh, is Elisha's prophecy now proven a lie, thus rendering him a false prophet? Scriptural evidence supporting opinions would be preferable.