The Immaculate Conception According to the Catholic Encyclopedia Mary was Pope Pius IX pronounced and defined this teaching in 1854. I would be interested to know of any verses of scripture which say the above things. Since this belief of Roman Catholicism wasn’t pronounced and defined until 1854, it must be a non-scriptural or extra-biblical belief of Roman Catholicism that has no support in the scriptures. I already know that Catholics use Genesis 3:15 and Luke 1:28 as “proof texts for their beliefs about the Immaculate Conception. But I’ve read those verses many times and there is not anything in those verses to indicate that Mary was born without original sin. How about it my Catholic friends, Can you defend your belief in the Immaculate Conception of Mary, from the scriptures?