Wouldn't the most obvious question rather be "Why did they take up stones to throw at him if your thinking is the same as theirs?"
They wanted to know, if he was trying to suggest, he was greater then their father Abraham, because if you were Abraham's descendant, you were of the promise, saved, and would be in the resurrection. Jesus is telling them they are not of Abraham, and they need to come to him for life. He is telling them they are not saved. Look what happened after, they tried to kill, and did kill the believers, and were trying to force the Law on them. They were threatened, and were being told they had it all wrong, by the uneducated. They did not think the believers were suggesting they were God either, but they still wanted to kill them.
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