I have several of Dr. Hahn’s tape and CD series. In the series “Romanism in Romans” he makes reference to his Protestant belief that Abraham is seen as justified in Gen15:6.
Dr. Hahn then mentions all the things Abraham did in Gen. 12, 13 and 14 and he wonders if Abraham could have done those things without saving faith. He then references Heb.11:8-9 which tells us that Abraham had “faith” back in Gen. 12. Dr. Hahn concludes that the story of Abraham is a steady growing in faith, a maturing in faith, right up to Gen.22 when Abraham offers up his son, Issac. I hope this helps.