In the times of the Old Testament, God had commanded the extermination of some Canaanite tribes that had inhabited a few particular places. For centuries, these people practiced incest, sodomy, bestiality and human sacrifice. Parents used to burn their firstborn children alive in order to honor demonic “gods” such as Baal. This infinite orgy had to be stopped!
One of the Saints of our times, the Blessed Elder Paisios, says: “In the Old Testament it is mentioned that God told the Israelites, “Send the Canaanites completely away from this land”. God knew better than us what should have been done. But they said, “That isn’t very nice. Let’s leave them. Let’s not kill them”. Later, though, they were lead to immorality and idolatry, and they sacrificed their children to idols, as it says in the book of Psalms. God knows what He is doing.”
The Lord decided that it is better to place those few Canaanite children in the joy of Paradise, than to leave them in this world. As for the animals, they had to be killed so that there might be boundaries to the Jews’ greediness. This shows how silly the speculation, that the Jews “invented” God for their own benefit, is. God never torments innocent people! As we see in the book of Job, He simply allows them to be tempted. Thus, it is clear that these infants died painlessly. The same applies to all the animals killed or sacrificed at His command in the Old Testament, since He loves animals too (Genesis 2:19-20, Exodus 23:11-12, Deuteronomy 22:6-7 and 25:4, Psalms 36:7, 103:21-30, 135:25,145:9,15-17 and 146:9, Proverbs 12:10, Isaiah 11:6-9, Jonah 4:11, Matthew 6:26, Luke 12:6, Romans 8:21). Even when God Himself commands someone’s punishment, He punishes only the guilty (Deuteronomy 20:16, Ezekiel 18:20), even if sometimes the innocent deal with the sins’ consequences. And, of course, Heaven is no punishment for the infants!
Above all, we must trust Him who acts only on account of His love for us. God is Love (1 John 4:8)! Anyway, if He were a sadist, would He become incarnate in order to suffer beyond imagination for our sake?