In First Kings, a book in the old testament of the Bible, Elijah the prophet challenges the worshippers of Baal to invoke Baal to light their altar during a drought.
After hours of prayer to the idol, the altars would not light, and Elijah taunts them saying he thinks their God Baal is on vacation.
Elijah then douses his altar with water and prays. God hears his cries and then burns the altar to a crisp. The people see the error of their ways and the drought ends when they pray to the true God.
God illuminated the false idol of Baal, which represents the absence of God in the world. Baal still has a presence in the world today as a deceiver. He tries to convince us that God is not real and we need a God who demands human sacrifice. Now human sacrifice is directly against God's wishes, and any Christian or Jew is directly commanded never to do this or harm another. Jesus is the Messianic covenant, and the last sacrifice.
God had to come to earth as a man because only blood can absolve sins. The Jewish high priest would sacrifice animals as sin offerings to absolve sins because in those days only blood could cure sins. The priest would sacrifice and pour blood on the altar even to absolve the people of sins they never knew they committed.