God created people to live in relationship with Himself. Worship is not a tortuous ordeal as some people who haven't experienced genuine worship might imagine it to be. Worship is being enraptured with God's wonderfulness, His perfections in every aspect. He is good, He is eternal, He is all-powerful, He is loving, and only in righteousness does he judge that which is unrighteous.
Friendship vs Tyrannical Slave Master. God is not oppressive to His own, He is a kind and faithful Friend. A father or mother should have respect given to them by their child that is different from the way their child relates to his or her peers. God expects us to relate to Him with respect to His being God. Just as parents have responsibilities to love and care for their children, God does the same for us, if we will become one of His children.
Remember, that is exactly how God originally created the world. There was no mention of God demanding from Adam and Eve in the Garden of Eden slavery as you described, "humans have to bow and scrape to a god all their life. What a waste of a life that everyday for most of the day one needs to be conscious of serving a master."
Instead there was only one commandment that required a deliberate choice on their part. They stole the fruit on that tree in direct disobedience to the only rule they had, knowing that God had warned them that "dying, you shall surely die."
So, what does a Creator, who is perfectly good and desires to live in happy relationship with beings He created, do when the creation chooses to become corrupt?
Kind of like HAL in
2001: A Space Odyssey https://en.wikipedia.org/wiki/HAL_9000
In the film, astronauts
David Bowman and Frank Poole consider disconnecting HAL's
cognitive circuits when he appears to be mistaken in reporting the presence of a fault in the spacecraft's communications antenna. They attempt to conceal what they are saying, but are unaware that HAL can
read their lips. Faced with the prospect of disconnection, HAL decides to kill the astronauts in order to protect and continue his programmed directives.
Satan turned from God and desires to take others with him. This is eternal murder. He is guilty of deliberately enticing Eve to disobey God.
God could have banished Satan to hell for all eternity before he tempted Eve. God could have banished Adam and Eve to hell immediately after they sinned, so that no more sin would be in His universe.
Some things about God's reasons we do not understand, but there are some things in the Bible that do shed a little light on these kinds of questions. One verse that does that for me is Romans 9:22. Two translations of the verse are below:
What if God, although choosing to show his wrath and make his power known, bore with great patience the objects of his wrath—prepared for destruction? NIV
In the same way, even though God has the right to show his anger and his power, he is very patient with those on whom his anger falls, who are destined for destruction. NLT
I speculate that a reason that God has allowed evil to manifest itself is so that He can demonstrate how just how evil evil really is. Maybe it's kind of like He has said, "Fine, you want it your way, you don't want Me to be involved, so I'll leave you alone."
In allowing evil to reveal itself for the horror that it is, He can one day judge all evil, separate that which is evil from that which is good, banish the evil forever from the presence of what is good, and be a completely righteous and good God to do so. No angels or people in heaven will have a doubt that evil should be banished.
In His mercy, God is patient with sinners, just as the verses above state. The heart of God toward sinners can be seen in this verse, "I have given her time to repent of her immorality, but she is unwilling." Rev 2:21
God wants people to repent. God freely offers to all reconciliation with Himself, giving to sinners the righteousness that we lack.
Think about this from God's perspective. He sent His Beloved Son, who is one with Him in nature, to our world. Both Jews and Gentiles were guilty of killing the Innocent One. The guilt of humanity is very deep in God's eyes.
Yet He pleads with us:
Say to them, ‘As surely as I live, declares the Sovereign LORD, I take no pleasure in the death of the wicked, but rather that they turn from their ways and live. Turn! Turn from your evil ways! Why will you die, people of Israel?’ Ezekiel 33:11
and made a way for those from other nations to be reconciled through what Jesus did at the cross:
Just as there were many who were appalled at him—
his appearance was so disfigured beyond that of any human being
and his form marred beyond human likeness—
so he will sprinkle many nations,
Isaiah 52:14, 15a