The story is fiction. No action could cost an omnipotent, omniscient, and omnibenevolent God anything since he could not have free will, and the freedom of choice, and could never be harmed by anyone, and could never suffer physically, or emotionally. Your God demands that people suffer, but he cannot suffer. Without choice, morality has no meaning. It would be impossible for an Omni God to ask people to love him since he always has to do what he does, and can only do good things. Therefore, the God of all of the Abrahamic religions does not exist.
If the God of the Bible had free will, then there are circumstances under which he would not have kept his promise to give believers eternal life, but that would be impossible for an Omni God. In other words, if the God of the Bible had free will, he would have the option not to keep his promise to give believers eternal life, but that would be impossible for an Omni God.
You have said that God did not have to create humans, but no logic supports such an absurd notion. If God did not create humans, and offer eternal life to believers, and keep his promise to give eternal life to believers, he would not be God.
John 3:16 says that one of God's motives for giving his Son to mankind was love. According to you, God did not have to manifest his love by creating humans, and offering them eternal life. That is ridiculous. An Omni God must always do the best possible thing since his omnibenevolent nature controls his thoughts, and actions.
Sacrificing animals, and people to God has been historically practiced by many people as a means to try to please God, but no God has ever made such an absurd request. A God making a sacrifice is even more ridiculous than humans making sacrifices. It is an absurd notion that during Old Testament times, God wanted humans to make sacrifices, and thousands of years later God made a sacrifice, and no longer wanted humans to sacrifice animals to him.
Christians criticize Judas, but why since the New Testament says that without the shedding of blood there is no remission of sin? If bad people had not killed Jesus, who else would have killed him, good people?
The vast majority of people have always chosen to believe in Gods since that is typical for humans. If Christianity had not come along, the vast majority of today's Christians would follow other religions, and would not be atheists, or agnostics. If theisticly minded people will usually choose some religion whether it is true or not, that proves that if one religion is true, and all other religions are false, God has not set up a system where people who honestly want to find the truth can always find it.
