The believers think "mathematical truth" was created by God and humans received it. Thus, we attribute mathematics to people (who had the brainstorm), but it is also discovered in nature.
You'll have to do some work to find out where you fit in.
"First, math somehow underlies the physical world, generates it. Or second, math is a human description of how we describe certain regularities in nature, and because there is so much possible mathematics, some equations are bound to fit.
As for the essence of mathematics, there are four possibilities. Only one is really true. Math could be: physical, in the real world, actually existing; mental, in the mind, only a human construct; Platonic, nonphysical, nonmental abstract objects; or fictional, anti-realist, utterly made up. Math is physical or mental or Platonic or fictional. Choose only one.
In peering down the dark well of deep reality, mathematics brings us closer to truth."
Is Mathematics Invented or Discovered? - Science and Religion Today