Yes, BAC, good points.
I'd like to add this: The blood of Jesus flows backwards and forwards in time. Abraham was covered by Jesus' blood because he had faith. This is why Jesus said this:
53 Are you greater than our father Abraham, who died? And the prophets died! Who do you make yourself out to be?"54 Jesus answered, "If I glorify myself, my glory is nothing. It is my Father who glorifies me, of whom you say, 'He is our God.' 55 But you have not known him. I know him. If I were to say that I do not know him, I would be a liar like you, but I do know him and I keep his word.56 Your father Abraham rejoiced that he would see my day. He saw it and was glad."
Literally, Abraham heard, received, and believed the gospel while it was still a mystery:
7 Know then that it is those of faith who are the sons of Abraham. 8 And the Scripture, foreseeing that God would justify the Gentiles by faith, preached the gospel beforehand to Abraham, saying, "In you shall all the nations be blessed."9 So then, those who are of faith are blessed along with Abraham, the man of faith.
If there is any faithfulness in me, it's to the glory of God. Thank You, Jesus!