It is rediculous for Jehovah’s Witnesses to bring up this as an objection. Look, the drinking of the blood of animals was given as a restriction in the old law. However, it was not absolute because it is impossible to drain every drop of blood from any meat. Anytime any Jew ate any meat, they consumed some blood. The problem was not the blood per se but what it represented. In the old testament the reason given for not drinking the blood of animals that the “life of the animal” was in the blood. The obvious pagan conotations can be easily seen and God did not want the Jews to be like the pagans. They were to be different. But again, it was not that there was an intrinsic problem with consuming blood. ALL of the meat that the Jews consumed had some blood in it, no matter how well they drained it. Now, the more important reason that the Jews were forbidden from drinking the blood concerned the covenant. The “life of the animal was in the blood” but as St. Paul tells us, the old covenant did not bring life, and to drink the blood was symbolic of the reception of life. The new covenant in Christ does bring life, though, and for that reason we are allowed to drink the blood of Christ and recieve his life in us.
Now this brings us to an important charge that protestants and JW’s bring against Catholics, and that is the Charge of canibalism. I would agree to eat the flesh of Christ and to drink his blood in a natural manner would be cannibalism. However, Catholics consume Christ in a super natural and sacramental manner in the Eucharist and this changes everything. Canibalism is no longer an issue. We are transformed into Christ in the Eucharist, he is not digested by us.
Finally, I find it silly that JW’s use the old testament condemenation of drinking the blood of animals as a condemnations of blood transfusions. The two are not the same, first of all, and the restriction was an old testament cannon law, and not a matter of natural morality.
In conclusion, the consumtion of blood is not intrinsically evil. It is only when a symbolism is imposed upon that it can be evil. However, in the new covenant, no permanent restriction against the consumtion of the blood of animals is imposed and no symbolism attach to the blood of animals. If there was such a restriction, no one would be allowed to eat any meat because all meat, no matter how well drained has blood in it. Furthermore, blood transfusions are not even related to drinking blood.