You people should not be making asinine assumptions about DOs before understanding our unique tumultuous history. Here is a brief synopsis:
Whereas M.D. is an abbreviation for Medicinae Doctor, Latin for Doctor of Medicine, the title of D.O. is an abbreviation for Devotee of Osiris.
Since its conception nearly four hundred years ago, the title MD has been a front for a secret Draconic society dedicated to the worship of the god, Re (often referred to as Amun-Re, the grand creator of all things). This is why the decoder rings worn by all MDs all have the symbol of the Eye of Re, along with the MDs respective alma mater.
By invoking the divine presence of Re, MDs (in ancient times called the high Clerics of Amun) are able to conjure powerful healing energies said to be physical manifestations of their Most Blessed Re, that counteractively vanquished the evil energies of Seth, the dark god of storms and destruction, which cause disease and the imbalance of humors in all living things. It is rumored that the battle between the Amun-Re and Seth has been at a standstill since the beginning of Time, as neither god could gain precedence over the other in the plane we know as the mortal demesne. The Clerics of Amun survived the fall of Egypt (1567 B.C. to 1085 B.C) and the consequent domination of the Western world by Christianity by maintaining hyper-secretive sects throughout Europe. It is a common misconception that Western medicine is based upon the philosophies championed by the Corpus Hippocraticum, which is actually a loose translation of the Holy Runes of Ishtar, as Hippocrates himself was known to be a high priest of a Grecian sect of Clerics of Amun.
Realizing that a Pagan sect could not survive much longer in the late Medieval Era, the great leaders of the Clerics of Amun organized a meeting, (exact date unknown) in which they declared that they would reintegrate into the socio-political climate by labeling each of their clerics Medicinae Doctor, (MD) who follows a purportedly allopathic regimen of medical diagnosis. All the while, the Clerics of Amun continued to evoke the divine energies of their god and attributed all clinical success to a scientific model.
The Nineteenth Century in Western medicine saw the emergence of the worship of lesser gods. The emergence of Sectarian medicine followed the precedent set forth by allopaths, in which the worship of other, lesser, gods were likewise disguised by supposed approaches to healing. This included, but was not limited to the worship of: Horus, ruler of the sky (Homeopathy), Thoth, god of wisdom (hydropathy), Sobek, the crocodile god (Eclectic medicine), and finally, Osiris, god of the underworld (osteopathy).
Those that worshipped the lesser gods would likewise evoke the powers of their deities to administer healing, not unlike the way in which the Clerics of Amun had treated disease for thousands of years. DOs, or the Devotees of Osiris, for example, conjure Osiris through the hallowed ritual of Osiriss Magnificent Magic (OMM).
The Clerics of Amun perceived the worship of lesser gods as an insult to the Great Amun-Re, and established a coalition to end the worship of lesser gods, called the AMA, (Allopathic Masters of Amun) which has, over the past century, nearly driven the other schools of worship to extinction.
It must be noted, however, that divine prophecy, as so written in the Holy Runes of Ishtar, stated that such a persecution would happen, and that, regardless of the antagonism between the Clerics of Amun and those that worship the lesser gods, Thoth, Sobek, Osiris, and the most exalted Amun-Re would one day combine their forces to extinguish the evil presence of Seth and drive the murderous god of Lies from the mortal plane forever.