Does the historicity of Scripture impact effectual faith? Paul seems to think so...
“And he made from one man (Adam) every nation of mankind to live on all the face of the earth, having determined allotted periods and the boundaries of their dwelling place, that they should seek God, in the hope that they might feel their way toward him and find him. Yet he is actually not far from each one of us, for “‘In him we live and move and have our being’;
as even some of your own poets have said, “‘For we are indeed his offspring.’”
(Acts 17:26–28 ESV)
Without Adam - Why Noah? Why Abraham? Why Moses? Why David? Why Temple? Why Sacrifice? Why Christ?