@Fil Albuquerque,
what is "true":
Truth can have a variety of meanings, such as the state of being in accord with a particular fact or reality, or being in accord with the body of real things, real events or actualities. 9you can't go outside it.
Or do you mean "true" as having fidelity to an original or to a standard or ideal (a standard you can't proof "true".
or is it "true" as a constancy or sincerity in action or character.( a character you can't proof)
"true" as you use it must have a beneficial use in order to be retained and you bring none.You can't plan or predict as it is not reliable, the more reliable and trustworthy an idea (as god exists) is, the more useful and potent it becomes for planning and prediction.
Your idea can't be used anywhere and anytime with maximum reliability it is clearly not generally considered the most powerful and potent "true" either. You should define this potency and applicability of "god exists" you need a "criterium" and bring none.
The method you use to recognize a "true" is your criterium of truth.
Since there is no single accepted criteria for god, they all can be considered "theories".
Theories and views of such truth or true can be debated.
Sure there are differing claims on questions as what constitutes truth; what things are truth bearers capable of being true or false; how to define and identify truth; the roles that revealed and acquired knowledge play; and whether truth is subjective, relative, objective, or absolute.
but they stay "theory" and so is your claim "why god must exists" just a theory, just as my counter argument is just a theory. If you want to go to war over a theory be my guest.