Good point. The inference is on a Creator, and we would like for such a Being(if it exists) to be well qualified in order to create a universe and be capable of knowing every living thing intimately. Infinity is a preferred characteristic of such a Being.
It is a Catholic teaching that angels are beings of pure intellect. While humans through time develop our intellect, Angels are created with a fully developed mind. It is debated that this is one reason Lucifer's sin was so grave, he was fully cognizant of his choice to rebel against God.
"You were not there for the beginning. You will not be there for the end. Your knowledge of what is going on can only be superficial and relative" William S. Burroughs