The apostle James had a reputation before his death as the picture of a true Hebrew. One would assume that his reputation came, in part, with his participation in and observation of the daily temple rituals. Otherwise, he would have been quite despised and scorned by his brethren - not honored.
Why did the apostles originally meet daily in the temple if the sacrifices were the "abomination" we imagine the writer of Hebrews renders them? Why was there no mention of this point to their fellow Jews in their preaching in Acts? Why did Stephen fail to bring up this point, even as his statements against the temple itself cost him his life?