R.C. Sproul's book on Romans, Chapter 10, page 106.
"When Paul speaks of Abraham's justification as being by faith, that is shorthand for saying that Abraham was justified by the righteousness of Christ. The only difference between our justification and Abraham's is that Abraham looked forward to the promised one."
Is there biblical evidence that Abraham looked forward to Christ. I know that it's felt that a view of Christ in the future is given in Genesis 3:
"And I will put enmity between you and the woman, And between your seed and her seed; He shall bruise you on the head, and you shall bruise Him on the heel.”
However it is believed that this was written by Moses, long after Abraham. Assuming that Genesis was written by Moses, was it from oral tradition that Abraham would have known, or was it direct revelation from God to Moses? Is there some other way we can assume that Abraham and other patriarchs had knowledge of the coming of Christ?