"Transmogrication,” Langdon said. “The vestiges of pagan religion in Christian symbology are undeniable. Egyptian sun disks became the halos of Catholic saints. Pictograms of Isis nursing her miraculously conceived son Horus became the blueprint for our modern images of the Virgin Mary nursing Baby Jesus. And virtually all the elements of the Catholic ritual—the miter, the altar, the doxology, and communion, the act of “God-eating”—were taken directly from earlier pagan mystery religions.”
Teabing groaned. “Don’t get a symbologist started on Christian icons. Nothing in Christianity is original. The pre-Christian God Mithras—called the Son of God and the Light of the World—was born on December 25, died, was buried in a rock tomb, and then resurrected in three days. By the way, December 25 is also the birthday of Osiris, Adonis, and Dionysus. The newborn Krishna was presented with gold, frankincense, and myrrh. Even Christianity’s weekly holy day was stolen from the pagans.”
“What do you mean?”
“Originally,” Langdon said, “Christianity honored the Jewish Sabbath of Saturday, but Constantine shifted it to coincide with the pagan’s veneration day of the sun.” He paused, grinning. “To this day, most churchgoers attend services on Sunday morning with no idea that they are there on account of the pagan sun god’s weekly tribute—Sunday.”
...
“An interesting note,” Langdon added. “Anyone who chose the forbidden gospels over Constantine’s version was deemed a heretic.
The word heretic derives from that moment in history. The Latin word haereticus means ‘choice.’ Those who ‘chose’ the original history of Christ were the world’s first heretics.”