Matthew Henry said, “…he took his own son, his eldest son, that was to succeed him, than whom nothing could be more dear to himself and his people, and offered him for a burnt-offering upon the wall, 2 Kings 3:27. He designed by this, (1.) To obtain the favour of Chemosh his god, which, being a devil, delighted in blood and murder, and the destruction of mankind.” Skeptics often say, “What sort of father would kill his own son? And yet that’s what God did to Jesus!” However, although Jesus is called the Son of God, and the Father refers to Him as His Son, there is far more to this than meets the unregenerate eye. The Bible tells us that God was in Christ, reconciling Himself to the world (see 2 Cor. 5:19). God was manifest in human form; He created a body and filled that body as a hand fills a glove (see 1 Tim. 3:16; Col. 1:15–20). So it was not a matter of an aloof God punishing an innocent person for the sin of the world, but rather, He took the sin of the world upon Himself, in Christ.
2 Kings 3:27 Then he took his eldest son who would have reigned in his place, and offered him as a burnt offering upon the wall; and there was great indignation against Israel. So they departed from him and returned to their own land.