If the universe was never created, how would it exist in the first place?

Everything in existence today was created.
A tree from the seed, the seed from the parent tree.
Fire is created via chemical reactions.
Light from the sun is created through fusion reactions.
The earth was created from rock and dust particles with the aid of gravity.

Its a 'common sense' law. If it was never created, then it never existed. So, how can people believe there is no god or higher power that created the universe? Obviously something had to.

How is it logical that an existing universe have no creator?