Why is belief in a higher power required?

[Statler Waldorf]

And they utterly destroyed all that was in the city, both man and woman, young and old, and ox, and sheep, and ass, with the edge of the sword. Joshua 6:21

So smote all the country ... he left none remaining, but utterly destroyed all that breathed, as the LORD God of Israel commanded. Joshua 10:40


Moses, Eleazar the priest, and all the leaders of the people went to meet them outside the camp. But Moses was furious with all the military commanders who had returned from the battle. "Why have you let all the women live?" he demanded. "These are the very ones who followed Balaam's advice and caused the people of Israel to rebel against the LORD at Mount Peor. They are the ones who caused the plague to strike the LORD's people. Now kill all the boys and all the women who have slept with a man. Only the young girls who are virgins may live; you may keep them for yourselves. (Numbers 31:7-18 NLT)

…and what does that prove about God?