Complex thought requires language. so what language was god using when he thought up the concept of making the universe?

Complex thought does not require language

God created language. He is not a thought. He is a being. A being's existence is not restricted by thought (unless, of course, you're an educated and yet intellectually honest Atheist and therefore a Solipsist).

Also, thought is not demonstrably necessary for [illusory] human cognition. Atheistic philosopher, Alex Rosenberg posited in "The Atheist's Guide to Reality" that according to Science/Empiricism/Materialism human beings necessarily lack consciousness and their body of knowledge is comparable to that of a termite wandering randomly until it builds structures conducive to its survival.

People can have thoughts without language.

Complex thought requires a brain, so why didn't you use yours when asking this question?

*Update: The answer you're looking for is Pig-Latin.

Paleohebrew?

I think your initial presumption is wrong.

Are you claiming that mute people are not capable of complex thought?

I think they are.

With love in Christ.

yes