If God is so great, why didn't it kill Satan from the beginning?

The logic of such a question leads to the idea that, if God would crush Satan at the start, then He should also crush every individual who (like Satan) rebels against God and challenges His right, as Creator, to do with His creatures as He wills. That would mean your instant destruction, the moment you chose to voice your contempt of God. And any God who would smash opposers in an instant, without giving them a fair hearing, or chance to prove they were right, and He was wrong, would be a despot.

So, one of the very reasons why God is so great, is that He does not instantly snuff out those who disagree with Him. That ought to make you very happy, and think more highly of God than you do. Simple logic, that.

You, the creature, have no grounds on which to hold God, your Creator, on trial.

When God gives life, it is forever.  However, some angels and people instead use their free will to choose eternal conscious death in the fires of hell.

All gods are myths 

Satan is not a name, but a description.  I say this because we're not told who he is.  He sunk so low, he had his name removed.

God is love.  Righteous.  Those two attributes don't kill what is hurtful.  Until!  There's a point when God deals eternally with it.

It has to do with Salvation, with all those God saves to be born, come to the Lord, be saved.

As one person put it, what is 'free' is 'free WON'T' not free will.

The NT says 'to those who received Jim's... So 'free WON'T' was operating.

To receive Him, God offers it.  Only God knows the heart; often we don't always know it.

The devil devolved.  Just as people change, so spirits may change.  

We'll find satan has connections to those who could come to Jesus: these people must see satan properly, drop this connection.

Satan is a god, has seed(offspring).  Jesus spoke of it.

I see your confusion.

It is IMPOSSIBLE for God to lie.

So, God is righteous, love, just and so on.

We also read of the mystery of iniquity:  we have enough in our lives and some things, like he'll are not explained.  I speak about scripture.

Where do you stand with Jesus?

The Bible provides a detailed answer to that question. Intelligent folk tend to read it to find the answer.

How dare you a mere imperfect sinful mortal question Jehovah God's actions; Jehovah IS the only true God Creator and Universal Sovereign. You would quickly be put in your place if you treated earthly rulers, some would jail you or even put you to death. Read God's word, ask for a Bible study and you will learn what Jehovah by means of the heavenly Kingdom IS currently doing  and when it comes in full power IS shortly going to do; go to jw.org where you can use all without charge and request a Bible study.

First up, if bible god created everything it also created satan. Its bible gods idea and part of its plan

"I form the light, and create darkness: I make peace, and create evil: I the LORD do all these things.". Isaiah 45:7

Because satan challenged the integrity of every human He will be held in death row for 1000 years during which time the ressurected are brought back to perfection (as was Adam) He is then let out of jail to test them and those who choose to follow him are all destroyed with him  Rev chapt 20 Gen 3;15

satan receives his promised bruise to the head That higghlights not only Jehovahs wisdom power and love but also His Justice

Good question, only God knows.