That's the question that plagues every single belief system, when it comes to religion vs. irreligion.

There's only One_True_God...

But who created Him?

There are multiple deities...

But who created them?

There are a bunch of atoms and gases that naturally formed everything in the universe...

But who created those atoms and gases?

There's some essence governing the universe that we can't comprehend...

But who created it?

It's a question for which nobody will ever have a sufficient answer.