The Big Bang theory was originally proposed by a Catholic priest (and mathematician, astronomer, physicist), Fr. Georges Lemaître: https://en.wikipedia.org/wik

The Big Bang theory was originally proposed by a Catholic priest (and mathematician, astronomer, physicist), Fr. Georges Lemaître: https://en.wikipedia.org/wiki/Georges_Lema%C3%AEtre https://en.wikipedia.org/wiki/Georges_Lema%C3%AEtre He "initially call[ed] it the 'hypothesis of the primeval atom'."