Beginner’s Guide to Modern Big Bang Cosmology Big bang cosmology has become an explosive topic. Heated reactions—and bitter resistance—have arisen from opposite directions in the last century but, ironically, for the same type of reasons: religious reasons. One group of big bang opponents includes those who understand the theory’s implications, and the other, those who misunderstand. People in the first group understand that the big bang denies the notion of an uncreated or self-existent universe.