In the new testament we have a god who wanted to forgive all mankind of its sins. Fine, but then why didn't he just forgive them? Why was it necessary to have a human sacrifice? To have his son tortured and executed In order for the sins of all mankind to be absolved?"
God is first a judge and second a father. Everything we see has an order to it whether we see it or not. Things always settle into the right order whether now or years later. While it may be easy to forgive someone, it doesn’t guarantee that they won’t do it again. And while God may forgive, sin must be still be punished. And that punishment is carried upon Christ.
The law (as I would like to call it) of Cause and Effect (Reaping and Sowing—biblical perspective) is very significant. It even reminds me of a verse:
“Can two walk together, except they be agreed? Will a lion roar in the forest, when he hath no prey? will a young lion cry out of his den, if he have taken nothing? Can a bird fall in a snare upon the earth, where no gin is for him? shall one take up a snare from the earth, and have taken nothing at all?”
Amos 3:3-5 KJV
There is always punishment for bad and reward for good.
So sin is forgiven but the consequences needs to be dealt with and that’s why Jesus Christ is necessary. He took the punishment we were supposed to take so we could live a new in Him.
The punishment for sin is death and angry from God.
“Behold, all souls are mine; as the soul of the father, so also the soul of the son is mine: the soul that sinneth, it shall die.”
Ezekiel 18:4 KJV
“And I will pour my fury upon Sin, the strength of Egypt; and I will cut off the multitude of No. And I will set fire in Egypt: Sin shall have great pain, and No shall be rent asunder, and Memphis shall have distresses daily.”
Ezekiel 30:15-16 KJV
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In the Old Testament, the way of dealing with sin was simply to sacrifice an animal because the punishment for sin was death. And that animals was their scapegoat.
“And Aaron shall lay both his hands upon the head of the live goat, and confess over him all the iniquities of the children of Israel, and all their transgressions in all their sins, putting them upon the head of the goat, and shall send him away by the hand of a fit man into the wilderness:”
Leviticus 16:21 KJV
Although God forgive them because their sins were transferred to the animals and justice was served. However, mankind was incapable of serving God because they still had the desire to sin; they were easily compelled to sin (via the devil). Honestly all of this is so similar to a court room.
Here’s an example:
Old Testament —
“But the Spirit of the Lord departed from Saul, and an evil spirit from the Lord troubled him.”
1 Samuel 16:14 KJV
New Testament —
“Jesus answered, He it is, to whom I shall give a sop, when I have dipped it. And when he had dipped the sop, he gave it to Judas Iscariot, the son of Simon. And after the sop Satan entered into him. Then said Jesus unto him, That thou doest, do quickly.”
John 13:26-27 KJV
Just to add, because man kind is both physical and spiritual there are physical and spiritual consequences. So when one reads the Bible they need to keep in mind the spiritual aspects of the scriptures which the Holy Spirit (who is the author) can reveal to you (a holy Christian).
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Fast forward to the New Testament, Jesus Christ became the sacrificial lamb and by his resurrection made it possible for mankind to serve him without giving into those desires. Once someone accepts Jesus Christ as their Lord and Savior, Jesus comes into their life and gives them that power to resist the devil just as he did in the wilderness.
“And when the tempter came to him, he said, If thou be the Son of God, command that these stones be made bread.
Then saith Jesus unto him, Get thee hence, Satan: for it is written, Thou shalt worship the Lord thy God, and him only shalt thou serve. Then the devil leaveth him, and, behold, angels came and ministered unto him.”
Matthew 4:3, 10-11 KJV
That ability to say no to the devil is the same power children of God are given to resist temptation and live a holy life.
To recap: God is first a judge. And the law he has established on earth is the law of sowing and reaping (cause and effect). When God interacts with man, he interacts with him abiding by the terms he has set to be an example (as a father).
Does this all make sense? I’m sure you might not be satisfied with my answer. But, I hope this answers your question.