The laws of nature exisited before the alledged big bang.
Without the laws of nature i.e. gravity, thermodynamics and
so forth the universe would not display the degree of orderliness it presently does. Are we to "believe" that
an explosion initiated an orderly universe?
Those laws of nature are so precise that were any of them to vary in the smallest percent then life could not exist at all.
This is one of the most powerful arguments in favor of God. It is statistically impossible (almost infinite improbability) for those physical constants to come into existence at random with the values necessary for life to exist.
That is why scientists had to create the wild-eyed notion that an infinite number of parallel universes must exist (the "multiverse" theory), for an infinite period of time, and our universe is just one of those random universes that just happened to have the right set of values.
God is much more likely. Particularly since God has already told us He exists and intervenes in our lives everyday.
BTW: I used to be a deist for over 25 years I am an engineer and scientist. At age 44 I discovered that Jesus Christ was the real thing. Without any shadow of a doubt and with more certainty than any scientific proof I know Jesus Christ was the Son of God and came to earth to show us how to connect with God and create a personal relationship with Him. I accepted the Holy Spirit into my soul and it was unlike anything that has ever happened in my life. It is more powerful than any other form of love or passion.
Jesus and God are as real as love, yet science cannot prove love exists either.
Flapdoodle. Time did not exist before the Big Bang. Thusly there is not even a "before" at all.