“Have you seen the world? No one god could have made this mess”
Shortly after the fall there was not one but many demon lords who turned to the exploration of the Marches. While Beleth was far and away the strongest, Leonard was one of the most clever. While the rest of Hell was embroiled in its civil war, the fallen Elohite Marquis of Beelzebub led a company of knights from the Order of the Fly into the far realms in an effort to corrupt the gods who lived there and convince them to steal human faith.
If God would not stand by his angels, Leonard would punish him by getting others to take his worship. If humans did not stand by god, they deserved all the hardships the lesser gods of the Marches would impose upon them. It was an equitable and poetic solution to the Habbalite who hoped the lord of heaven would recognize the loss of the essence and thus see the error of His ways.