The power of miracles was not omnipotent, of course. When it came to resurrecting living beings in particular, it could only revive creatures that were sufficiently "weak."
"Weak," in this case, was not determined by attributes or combat strength, but by the total amount of divinity they possessed.
Before returning to Earth, Mu You had already confirmed the specific rules of miraculous resurrection with the Lamp Genie. In general, four conditions had to be met.
First, the person had to have died within the last three days. If more than three days had passed, even the power of miracles could not revive them.
Second, the person had to be below three stars. Creatures rated above three stars by the Divinity System fell outside the power of miracles' control and could not be revived.
This was the hardest condition to meet, and it was why both the God Race and the Fool Ancestors had been wiped out before.
Three stars was not a particularly difficult level to reach. Evolving from a faithless person into a three-star believer actually required only 650 points of divinity in total (50+150+450).
Once they entered the Giant World and gained a source of divinity, anyone could accumulate that amount in very little time.
When the Fool Ancestors had entered the Giant World together and encountered the God-Eater Beasts, every last one of them had already surpassed three stars.
As for the God Race, even their newborn infants were already creatures above three stars.
Thus, when those two races encountered the God-Eater Beasts back then, there had been no possibility of eliminating the beasts inside them by dying and then reviving.
Of course, neither race had any information on the God-Eater Beasts at the time, either. They were entirely unknown beings, and neither race had any idea