Early Church Evidence Against Transubstantiation

"Moreover, among the Tauri of Pontus, and to the Egyptian Busiris, it was a sacred rite to immolate their guests, and for the Galli to slaughter to Mercury human, or rather inhuman, sacrifices. The Roman sacrificers buried living a Greek man and a Greek woman, a Gallic man and a Gallic woman; and to this day, Jupiter Latiaris is worshipped by them with murder; and, what is worthy of the son of Saturn, he is gorged with the blood of an evil and criminal man. I believe that he himself taught Catiline to conspire under a compact of blood, and Bellona to steep her sacred rites with a draught of human gore, and taught men to heal epilepsy with the blood of a man, that is, with a worse disease. They also are not unlike to him who devour the wild beasts from the arena, besmeared and stained with blood, or fattened with the limbs or the entrails of men. To us it is not lawful either to see or to hear of homicide; and so much do we shrink from human blood, that we do not use the blood even of eatable animals in our food."

The Octavius of Minucius Felix, Chapter XXX