And if mathematics is the language with God has written the universe, then Goedel must be Satan.
Are you asserting that relativity is absolutely true, or is it a really good approximation?
From relativity/Riemannian geometry to mirror symmetry to physical dualities - math is unreasonably effective.
As to the language God used in speaking the world into existence, perhaps it has an element of math. The Hebrew alphabet, for instance, is mathematical.
But I would expect the speaking itself to manifest the harmonics we observe - from sound waves in the early universe to information in biological systems [Shannon paraphrased successful communications] to vibrations of strings [string theory].
Seems to me there will be a mathematical relationship between the geometry and the harmonics. When it is found, if I am still around to do so, I'll make a 4th item on my list of things from science which "scream" that He is eternal God.
For Lurkers, the three on my list so far are:
2. the unreasonable effectiveness of math and,
3. the presence of information [Shannon] in biological systems.