Infinite complexity - philosophical speculation and a possible reason to either go mad or believe in God -

I was thinking about Quarks, the smallest known particle so far. Scientists don't know what is inside them/what they're made up of.

But say that they do discover that they're made up of smaller particles and then they discover that those particles are made up of yet smaller particles and that those particles are made up of even smaller particles etcetera, ad infinitum.

Then, at the opposite end, physicists look outside of this universe and find a larger universe, then look outside of that universe and find an even larger universe etcetera, ad infinitum.

If that happens then the everything that exists (some kind of infinitely layered russian doll) may be infinitely complex and something which is infinitely complex can NEVER be understood.

And if it turns out that existence is just so vast that we can never understand more than a quark sized part of it then trying to understand it would seem like a cruel wild goose chase; a sisyphean task of epic proportions that, I think, would either drive you mad or make you give up and say "Why not just believe in God?".