Fortunately the Bible later explains that Abraham remembered God had told him "Through Isaac shall your offspring be named." and he therefore correctly reasoned

Fortunately the Bible later explains that Abraham remembered God had told him "Through Isaac shall your offspring be named." and he therefore correctly reasoned "that God was able even to raise [Isaac] from the dead" (Hebrews 11:18-19). At worst, therefore, Isaac would only have been temporarily dead, which was not a feature observed of Canaanite child sacrifice.