Let me continue on that point. The gentiles surrounding the Hebrews deliberately retained the blood in the animal for their own consumption, using strangulation to kill it. That was a specific part of the pagan temple ritual. That continued to a specific pagan temple ritual even into the 1st century. First century pagans also often drained the blood to drink it separately or cook with it.
But the important point is that consuming the blood was specifically part of their pagan idolatry ritual.
This is where there is a distinction between what Paul is teaching in 1 Corinthians 8 and 1 Corinthians 10
Therefore, my beloved, flee from idolatry. I speak to reasonable people; judge for yourselves what I say. Is not the cup of blessing that we bless a participation in the blood of Christ? And is not the bread that we break a participation in the body of Christ? Because there is one loaf, we who are many are one body; for we all partake of the one loaf.
Paul was speaking of the Holy Communion, which is the ritual of the Church.
Consider the people of Israel: Are not those who eat the sacrifices fellow partakers in the altar? Am I suggesting, then, that food sacrificed to an idol is anything, or that an idol is anything? No, but the sacrifices of pagans are offered to demons, not to God. And I do not want you to be participants with demons. You cannot drink the cup of the Lord and the cup of demons too; you cannot partake in the table of the Lord and the table of demons too. Are we trying to provoke the Lord to jealousy? Are we stronger than He? 1 Corinthians 10
Now Paul is talking about pagan idolatry rituals. Paul has already said that eating the meat itself is nothing because nothing happens to the meat during the course of the pagan ritual--meat bought in the market was fine, even though the butcher may have prayed to an idol as he slew it. Paul is instructing them, however, not to participate in the pagan ritual itself. The ritual does nothing to the dead meat, but participating in the idolatry ritual does do something harmful to a Christian's living spirit.
This is the same thing the Council of Jerusalem said in their letter to the gentiles, because each of the four practices they forbade were specific to pagan idolatry rituals.