Do You Practice Mithraism?
http://www.cogwriter.com/christianity-mithraism.htm
Before going into doctrine, perhaps some background on Mithras and Mithraism would be appropriate. "Mithras” is the Latin name of a Vedic god that the ancient Persians called “Mithra,” and in the Rig Veda is called “Mitra.”
Mithras (often spelled Mithra) was a sun-god. Mithraism seemed to enter the Roman Empire about a century before Jesus was crucified. Mithras was believed to have been born out of a rock in an "underground cavern" (Ulansey D. The origins of the Mithraic mysteries: cosmology and salvation in the ancient world. Oxford University Press US, 1991, p. 36). (Many also claim that Jesus was too, please see Was Jesus Born in the Grotto of the Nativity?).
Was Jesus Born in the Grotto of the Nativity?
http://www.cogwriter.com/jesus-born-in-a-cave.htm
Notice what Justin Martyr taught:
And when those who record the mysteries of Mithras say that he was begotten of a rock, and call the place where those who believe in him are initiated a cave…they have attempted likewise to imitate the whole of Isaiah's words?…'he shall dwell in the lofty cave of the strong rock. Bread shall be given to him, and his water [shall be] sure…'…
But when the Child was born in Bethlehem, since Joseph could not find a lodging in that village, he took up his quarters in a certain cave near the village; and while they were there Mary brought forth the Christ and placed Him in a manger, and here the Magi who came from Arabia found Him. I have repeated to you what Isaiah foretold about the sign which foreshadowed the cave… Then I repeated the passage from Isaiah which I have already written, adding that, by means of those words, those who presided over the mysteries of Mithras were stirred up by the devil to say that in a place, called among them a cave, they were initiated by him (Justin. Dialogue with Trypho, Chapters LXX and LXXVIII).