Exodus 20:4-5: "Thou shalt not make unto thee any graven image, or any likeness of anything that is in the heaven above, that is in the earth beneath, or that is in the water under the earth. Thou shalt not bow down thyself to them, nor serve them . . . "
That is called: "IDOLATRY" ----
It's idolatry to worship an image. IF Christ IS indeed "Really" in the Sacrament, then it isn't idolatry to adore The Sacrament, becuase it wouldn't be an image, but Christ Himself.