The seedbed of Big Bang speculations are ancient global cosmic events described by Eastern Advaitans and Greek nature sages as Cosmic Eggs. One Hindu belief was that Brahman (the Void or energy field) spontaneously generated itself as something like a seed or singularity about 4.3 billion years ago and then evolved under its’ own power by which it expanded and formed all that exists:
“These Hindus believed in an eternal Universe that had cycles of rebirth, destruction and dormancy, known as ‘kalpas’, rather like oscillating big bang theories. We also read in the Hindu Bhagavad Gita that the god Krishna says, ‘I am the source from which all creatures evolve.” (Evolution: An Ancient Pagan Idea, Paul James Griffith, creation.com)
The Pontiff denies “creation ex nihilo”?