You seemed to have misunderstood. The body is already submissive to the system set up by God, we call it laws of nature. It is the mind that needs to do it too so that there is cooperation.
We were discussing mind and the body.
The laws of nature is not external to matter. The matter, by its self-nature generates these laws. For example, mass is an intrinsic property of matter produces the gravitational force. Same for charge and electric force. So material in not submissive to some external law, rather the laws are an extension of the nature of matter itself.
You are trying to conform your understanding of the world and God based on prior beliefs from the quran (submission, control, what is just etc.). That is deluding you regarding how the world really is like.
Because we were given life and that didn't come from anywhere but the source. Acknowledgment is the first step.
But what has morality to do with it. It may be wrong to believe that earth is flat, but its not immoral and worth punishing anyone for it. Earth does not mind and neither does God (if he is God) because lacking ego, he does not need, require or demand recognition.
No, rather these things are for the betterment of ourselves.
So.... explain again why God thinks its immoral to not believe in him in the correct way..so much so that the person deserves Hell.