Curiously enough, this was once a topic of serious and heated debate among Christian theologists.
The bone of contention is whether there is any limit to how small God can make an angel? If not, then there can be an actual infinity of angels on the pin, contrary to Aristotlian philosphies underpinning the Medieval church. If so, then there is a size limit to God's power of creation.
I don't think Christian theologists worry about it much any more. Serious scholarship isn't what it used to be among them.