HUGE smile at dear tec (the greatest of love and peace to you, dear one!). It wasn't a test - God does not "try" us with evil. It was about faith, as you say... AND "reading" hearts, particularly Abraham's... and what that heart said about love for... the MOST Holy One of Israel, JAH of Armies. Abraham could have hidden how he TRULY felt about the matter from another human, but he could not have hidden what was in his heart from JAH. His heart was opened and exposed to that One throughout the entire ordeal... and not once... not ONCE... did his halt falter. His love... for JAH... did not fail. As a result, JAH's love for HIM... did not fail... and still has not failed. To show HIS love for Abraham, God granted the latter the privilege of becoming the father of Israel... through whom God's His own Son... would come into this world.
It was also much about ISAAC'S faith... and love, too: in and for HIS father... Abraham. Isaac could have begged off and said, "No way!". But... he had faith in his father, Abraham, that that one knew what was best, that that one's faith in God was RIGHT... and he loved his FATHER... so much so that he would have given his life if he father called for it. Remember, Isaac got up on the altar, without fighting, without protest. He went WILLINGLY... because of his love for his father.
Which is what Christ did. Yes, he gave his life because he loved us... but that was not the primary reason. The primary reason... was because he loved his FATHER... and wanted to do HIS will. That's why he said, "Father, if possible, REMOVE this cup from me. Yet, not what I will, but what YOU will."
Christ loved and loves us... and gave his life because of that love. But GOD loved us even before our Lord. HE loved us SO much that HE gave His Son. We might think it was hard for Christ - I promise you... as a parent... it was harder for JAH. Ask any parent whose child willing joins the military... who is willing to give their life for their convictions. Going to battle may be hard for that child. LETTING him/her go... another thing, entirely.
Again, peace to you, dear one... and may JAH bless!
YSSFS of Christ,