sacrifice does not always mean killing/death. sacrifice in the bible is an offering/gift. it can mean a sacrifice of praise (Hos. 4:12) and the sacrifice of thanksgiving (Ps. 50:14). Israelites also made grain offerings, drink offerings, et cetera. One sacrifice was called the wave offering. in Numbers 8:9–15, the whole Hebrew tribe of Levi was presented to God as a wave offering. In a similar way, the Mass is an offering, a sacrifice, where Christ is presented before the Father. again, Jesus does not die (no shedding of blood) and under the appearance of bread and wine is wholly consumed. in cannibalism, there is shedding of blood but in communion, Jesus gave himself to us in an unbloody manner.
paul was contrasting those who participate in the altar/table of demons and those who partake of the altar/table of the Lord. i am sorry to tell you that our priests, despite their sins, and unlike you, do believe in the real presence of Jesus christ in the bread and wind. you do not have to do any research at all since you believe you know everything and the catholics are always wrong.