The Priest does not wear the Stole outside of the Chausible, as depicted in this episode. Rather, the Stole is worn underneath the Chausible.
The priest says that the word "miracle" doesn't appear in the Old or New Testaments of the Bible. As a Catholic Priest, he would likely be referring to the New American Bible, and in that translation, the word "miracle" or "miracles" never appears, though many miracles are described. However, in most other Bible translations, "miracle" or "miracles" appears multiple times: ESV (13), NASB (31), KJV (37), NIV (42).