It's still hard to conceive a god who kill innocent children en masse. Where's justice in that? To make justice you need first that someone conscientiously commits a crime and the punishment must fit the crime. If your god can break this rule then he's committing a contradiction of the rules which himself created, if he's contradictory then he isn't a real god
If you cook a meal, do you not have both the power and right to share it with whom you please, or to not share it at all?
That's exactly what I'm trying to point out: if the god of the Bible can change the notion of justice (opening exceptions from the natural law which himself supposedly created) whenever he wants then he cannot be a god, because one of the characteristics of the God is being perfect and immutable, if he can "change his mind" about what is justice then he's mutable and mutability is not perfect
Another example how the Bible is contradictory: "The Lord reigns forever; he has established his throne for judgment. He rules the world in righteousness and judges the peoples with equity." (Psalm 9:7-8) If he "judges with equity" why did he command the killing of innocent children?