Do we fully understand what was all done for us?

Our God knew fully what lay ahead before there was time. He knew Lucifer with his free will would choose .
Isaiah 14:14 ” I will ascend above the heights of the clouds, I will be like the Most High.” Then Adam and Eve , with their free will would chose too
Genesis 3:6,7 And when the woman saw the tree was good for food, and that it was pleasant to the eyes, and a tree to be desired to make one wise, she took of the fruit there of, and did eat, and gave also unto her husband with her; and he did eat.
So God had to remove the tree of life, for sin could have no part of Him. Yet we see the first sacrifice to cover them and give them a taste of what He had to do in the future. Abel realized that by the death of a lamb, was a foretaste of Jesus death on the cross and the shedding of blood would cleanse you before God. Where Cain brought the fruit of his work, again never covering the sin in his life. It is not by works lest any man should boast but the blood of Christ, His Son, cleanseth us from all sin.
And all through the O.T. We example after another of the coming of the sinless one to die for our sin.
Look at Abraham, he had to have faith that God would make a great nation out of Isaac, which in turn also gave us a chance to become the children of the Most High.
Then the establishing the nations escape out of Egypt, with the blood on the door posts. And the sacrifices in the tabernacle and later the temple. All pointing to the coming death of Christ for man kinds sin through all time.
Yet we still have a free will to accept His work done for all or turn our back and spend an eternity in Hell. The choose is clear accept or reject His gift to all man kind.