Modern physics has not proven that an uncaused cause exists.<quoted text>
In order to use the "first cause" argument, you would have to prove that everything has a cause. Modern physics has proven that it doesn't, therefore the entire "first cause" argument is bogus to begin with.
In order to argue that a "deity caused everything" you would need to provide a foundation for your claim that a deity does in fact exist. Then you would have to further show evidence that it was your particular version of a deity that caused everything.
You have never even tried to show any evidence of your first premise. You simply make the claim and expect everybody to just take your word for it.
It has theorised about the possibility and like most atheists, you have taken a theory and tried to pretend it is empirical evidence.
You have no evidence for this, only the faith that atheism requires...