Sure.....
The necessity for Christ to come in the form of a human child who would grow up and offer to die for mankind became necessary when Adam and his wife disobeyed the command of God, not to eat from the tree of the knowledge of good and evil. God had generously provided every kind of fruit bearing tree for them to enjoy, but just one tree he claimed as his own. To steal from that tree carried the death penalty. Stealing from their Sovereign was a capital crime.
This disobedience came from the influence of a rebel spirit creature who became "satan the devil". Masquerading as a serpent, he lied to the woman in order to separate her from God so that he could gain human worship for himself. Of course, he wanted them both, but plotted a way to deceive the woman (the younger and less educated and experienced) so to force the man to divide his loyalties.....obey his God and lose his wife.... or obey his wife and lose everything? He chose to side with his wife. The old tactic of "divide and conquer" was born.
His plan worked and he got both of them to break God's law, thereby becoming their god and ruler.
The woman was deceived but the man was not. Adam could have made a different decision which would have had a different outcome, but he didn't.....and condemned all of his children to death. (Romans 5:12)
Their sin led to eventual death, but their children were born in sin through no fault on their part. Disobedience carried the death penalty as they all knew, but sin entered into the world in a way that the humans could not have imagined. Sin led to physical and spiritual imperfection, and as the humans aged, sickness and bad behavior was manifested. Within one generation, a murderer was produced....and humans have been murdering one another ever since.
Right there in the garden God uttered his first prophesy, addressed to the serpent....
"I will put enmity between you and the woman, and between your offspring and her offspring; he shall bruise your head, and you shall bruise his heel.” (ESV)
This prophesy was mysterious because God did not identify the players specifically and it was left open until the coming of Jesus as the Messiah in 29CE.
God's law given to Israel declared...
"Your eye shall not pity. It shall be life for life, eye for eye, tooth for tooth, hand for hand, foot for foot."
So God's law called for equivalency. If someone took a life, their own life was to be forfeited. In the case of the first humans, the lives they took were those of their children. They died for their disobedience, but the curse of death remained for all their offspring.
"The wages of sin is death" (Romans 6:23) so because all humans sinned, it meant that they would all die, and unless someone came to repay the debt that Adam left for them, it would remain unpaid indefinitely.
This is where Jesus comes in. Like someone who steps in front of another to take a bullet for them, so Christ came to offer his sinless life for the sinless life we never got to live. Only a 'sinless life for a sinless life' would pay the redemption price. Since no other human was sinless, Jesus had to come from heaven, to be born as a sinless human to offer his life for ours. This he did willingly....an act for which we are eternally grateful and which Jesus told us to remember as we gather together to commemorate this event.
It falls on this coming Friday (April 15th) after sundown, on a night of the full moon.
As God does not operate in earth time, it seems to be taking such a long time to accomplish his purpose in connection with the sacrifice of his son, but when we realize that the apostle Peter wrote....
"But do not overlook this one fact, beloved, that with the Lord one day is as a thousand years, and a thousand years as one day." (ESV)...we can see that its only been less than a week to him. We can be patient however because the trials of this life, brought about by Adam's sin, and the devil's rulership of this world, will seem like nothing, when everlasting life is restored to mankind and the purpose of God to have perfect humans enjoying life in paradise on earth forever will be restored. (Isaiah 55:11; Isaiah 65:17)
Revelation 21:2-4
"And I saw the holy city, new Jerusalem, coming down out of heaven from God, prepared as a bride adorned for her husband. 3 And I heard a loud voice from the throne saying, “Behold, the dwelling place of God is with man. He will dwell with them, and they will be his people, and God himself will be with them as their God. 4 He will wipe away every tear from their eyes, and death shall be no more, neither shall there be mourning, nor crying, nor pain anymore, for the former things have passed away.” (ESV)
That is how the Bible explains Christ's sacrifice to me....
Please don't hesitate to ask questions....if something is not clear....