"It is impossible to know precisely how, out of nothing, the universe began to exist.
According to the big bang theory—the theory most widely accepted in the scientific community—in the beginning, there appeared an infinitely small and dense burning ball that gave rise to space, matter, and energy."* - "Britannica.Illustrated.Science.Library.2009 : WHAT IS THE UNIVERSE?".
The truth is the scientists is too "Arrogant" to admit that there was creation process done by a creator.How nothing , absolutely nothing, become spontaneously everything ?! How nothing triggered nothing to make the universe, galaxies, stars, planets and finally you?! It's absolute arrogance to claim that you know everything then try to prove it with no reasons at all. They claim that there way is the way of "Reason and logic" but soon you find that there way is only the way of "Stubbornness and ingratitude"!.