I believe in Big Bang caused by an Almighty, Wise God. An accidental Big Bang would have resulted in a totally chaotic and destructive end instead of a well organized Universe.
21:30 Have the disbelievers in Divine Laws never thought that the heavens and earth used to be one solid mass and We exploded them asunder? And that out of water We made every living thing? Will they not, then, acknowledge the truth? [Here is a clear allusion to the Big Bang theory. Numerous celestial bodies came into being and started swimming along in their orbits. Almost all modern astrophysicists believe that this Universe has originated as one entity from one single element, hydrogen that in stages became consolidated with gravity and then broke apart into celestial bodies. 21:33, 24:45, 36:40, 79:30]