The Big Bang Theory was actually first theorized by a Catholic priest

No, not the  TV show of questionable quality, but rather the scientific theory that the Universe was created through an explosion that resulted in the Universe being the way we know it now. 

That idea was first published by a Belgian priest named Monsignor Georges Henri Joseph Edouard Lemaitre. He was also an astronomer and professor of physics at a Catholic university. He also was the first to develop Hubble Law and the Hubble constant. He published his information in 1927, which was two years before Edwin Hubble published his findings.

(Source)