Another good post by Kermit Zarley on his blog.
It is most significant that neither the witnesses nor Sanhedrin members accused Jesus of ever claiming to be God. Jews had so accused Jesus twice in his career; yet both times he denied their accusation (John 5.16-47; 10.30-38). Apparently, they accepted his denial.
John A.T. Robinson rightly maintains that if Jesus had ever claimed to be God, “it is inconceivable… that it should not come out in the charges against him at the trial, where again the worst that can be said about him is that he claimed to be ‘God’s son.’”
Read the whole thing to find out why they accused Jesus of “blasphemy” on that occasion.