Abraham didn’t understand God very well (at least not early on). I don’t say that as a dig against the Patriarch. I don’t think any of us understand God very well either.
True faith, saving faith that receives the good news about the Lamb of God who takes away the sin of the world is a faith created in us by the Holy Spirit through the Gospel.
As an avid movie-goer, one of the ways Scripture comes alive for me is to picture the stories as if they were scenes and beats from a live-action movie.
We fly away to the judgment seat of God. There we shall appear before the One who knows all, before whom nothing is hidden. Do you really think you can conceal anything from Him?