God's existence--A different approach

I'm not following that logic at all. If the reality is a created construct, created by an entity outside of that reality, the exception of the creator would be obvious (though as noted, it's also equally obvious that some rules governing the reality that the alleged creator lives in would apply to both that creator and to our construct) but why would the reality/universe itself have an exemption since it were created within it's own ruleset?

But how do you know that the reality is a created construct? Why can we not postulate that the framework has always been there, and it's only the contents - the matter and energy - that necessarily had a cause?

But let's assume the universe was in fact created. Something triggered the Big Bang. Something that is clearly outside the rules. What reason have we to believe that that something is omnipotent, omniscient, and omnibenevolent? What indication is there that it's even sentient?

Calling that something "God" is a simple continuation of what humans have been doing for millenia: using "God" instead of "unknown".
"What makes the Sun move across the sky?"
"Apollo pulls it in his chariot."
--- Enter science. Kepler, Galileo, Newton, etc.
"What makes the Sun move across the sky?"
"It only appears to move because the Earth is rotating on its axis and around the sun."
"Why does the Earth rotate?"
"Gravity, angular momentum, yadda yadda."
"Why is there gravity?"
"Eh... God made it."