Fiction never is logically consistent with reality. That's just the nature of fiction.
"Science fact need not be logical at all."
facts must be true. That relationship of facts and reality itself must be perfectly logical, or reality could not exist.
"There is literally no way to determine exactly what caused it all to begin.
Reality can be examined. The universe can be seen to arise as a phase transition from what already existed. There's no logical reason needed to know that there was no beginnig for what always existed. In fact the law of conservation of energy insists that what exists has no beginning.
" the big bang is, of course, a theory."
Nevertheless, it is a theory, because there's plenty of evidence for it. It's the beginning that is logically consistent with Genesis and John.
"Why not God?"
God's concern is with eternal life. He provided no evidence that He created the universe, because He had reason to not to. What He did provide is the sign of Jonah, the Holy Spirit. Matt 12:39 He answered, "A wicked and adulterous generation asks for a miraculous sign! But none will be given it except the sign of the prophet Jonah. If one is concerned with providing scientific evidence that God created the universe, they are simply attempting to provide a miracle that God said He would never provide.
If one is concerned with the testimony of the Holy Spirit and holds the same values, then the logical consistency of Genesis and the NT with the results compiled by science is sufficent for sound belief by the Epicurus Priciple- keep all theories consistent with the evidence.
On the contrary..... He tells us He did.
The first and foremost reason is that He tells us in Genesis that He did. And there are a multitude of other verses that support it, in addition to the teachings of Jesus.
Reality is real even if it don't appear logical to humans..
God is very logical.. its just which God you comprehend..
There are many Gods.. including the real one..
If you have NO God then your God becomes yourself..
Getting rid of God is like ignoring yourself in a mirror..
Its like being blind.. the image is still there anyway..