To the question of does God exist, the answer is whether Intelligence created Life

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Everything is made of energy, matter is a concentrate of energy! Light, every type of radiation, is energy at a different frequency.

And thus everything, both intelligent and non-intelligent, is made of energy of one form or another. From that, it is trivial to deduce that energy alone is insufficient to explain intelligence. The rules of energy alone won't be enough, so arguments from thermodynamics will be insufficient at best, and completely wrong at the worst.

In a complex system like the universe, the first important thing is to realize that we humans are made of energy. When we realize this, then we can start looking for the complex!