Time before the big bang universe is a serious research subject for physisists.
The 3 dimensions can be theoretically thought of to exist without movement Through time.
Who says and has PROVEN there was no time before there was space and its energy matter content?
There is no arrow of time.-- There is an arrow indicating our direction and movement through time.
Arrow is matter, and we are part of it and are flying through time. look at your time-speedometer, its called a clock.
Uhr = Clock in middle European, Einstein's working language, from "ur" the original, quintessential, eternal.
Eternal time thinking is a linguistic, not a religious thing.
Think of yourself as sitting on the arrow of space, traveling through time, it was aimed forward, into the future.
but future time already exists, it has for eternity.
If you traved the movement of the arrow back to its start, the singularity of the Big Bang, it would stop. its wrong way MOVEMENT Through Time would stop.
But Time would not stop, it never moved.
there is no day, a measure of distance MOVED or traveled THROUGH time before the big bang.
There was no yesterday before the first day of the universe. because there was no Movement (wrong, or any way) THROUGH stationary time.
Characterizing those that search for proof of time BEFORE the Big Bang Beginning as religious, is not helpfull to the discussion at hand.
Since "God" does not move either, there is no measured time he did wait, twiddling his thumbs?
as is said It is his perogative. only busy bodies would reproach his idleness- if any. and
then of course ther is the century old
"he was preparing a hot place for those that ask questions like that, a very hot place" answer.