The structure of the universe is evidence of God and mathematics.
My point is this. Just because the Bible doesn't specifically mention something doesn't mean that such a thing doesn't exist. The Bible doesn't mention mathematics, but everything in the material world can be quantified (even if we humans haven't yet discovered the mathematics to express it).
It is quite possible that we will come to see that even the spiritual world will be quantifiable...when we get there.
As an aside, many people of faith believe that what is behind these UFOs are beings that we know as demons and not aliens from distant planets and star systems.
There is (or was) a rather large contingent of general officers in the Pentagon who say they know what these beings are (i.e., demons) and we would be well advised to stay away from them.
Let me clarify my statement.
The structure of the universe can, we believe, be expressed mathematically (even though we don't know all that is in the universe nor have we discovered all the mathematics necessary to model what we know of it).
Take gravity for example.
Mathematically, gravity is well-understood through Newton’s equations for most everyday scenarios and Einstein’s equations for more extreme cases like black holes or the bending of light near stars. However, its underlying nature, especially at the quantum level, remains one of the biggest open questions in physics.