And as no one is good, and you yourself said you are either good or evil, everyone including you and me is 100% evil?
Yep.
Only God is good.
It gets better, because if you assume that you have to be good to get into heaven (which I presume most Christians do),
Most Christians would be wrong to presume this. Heaven is free.
and you can never be good, then we're all going to hell.
God through Jesus did good for us all because we are unable to do good ourselves. We put our trust in God's goodness which He did for us and were all going to heaven. Apart from God's goodness we all go to hell. Thank God for His goodness.
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In the hearts of evil men...and women.
But some are more good than others?
Not by Gods standard.
There is no one who does good, not even one. - Rom 3:12.
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And if Satan healed a child that would be evil?
If Stan does it, it's all evil. Don't trust him.
relying on the actions of two prominent individuals is a major folly for determining good and evil. Why? before the NT God was a killer. does that mean killing is good? Killing babies is good?
If God does it, it's all good. Trust Him.
You do see the problem here right?
Nope.
Your definition is twisted and flawed
Your definition of Killing when applied to what God does is twisted and flawed.
God doesnt kill the way man kills. God takes. All life belongs to God and He has every right to take what is His if He chooses to. We do not.
The earth is the LORD's, and everything in it, the world, and all who live in it - Ps 24:1.
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When Satin obeyed God by not killing Job, was he doing good or evil by following God's instructions?
Evil.
It was a selfish act of self preservation on his part. He was afraid of what God would do if he didn't obey.
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In the Bible, "Lucifer" does not refer to Satan, nor does it refer to a being who became Satan.
That depends on which Bible you read and how you interpret it.
How you are fallen from heaven, O Lucifer, son of the morning! How you are cut down to the ground, you who weakened the nations! - Isa 14:12.
He [Jesus]
replied, "I saw Satan fall like lightning from heaven." - Luke 10:18.
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So God sanctioned Evil then?
Nope.
He allows it.
Freedom of choice is important to God, even if it means Him having to endure evil behavior for a while until His purpose for it is completed.
Then God said, "Let Us make man in Our image, according to Our likeness." - Gen 1:26.
Knowing good and evil by hard experience goes a long way in helping us to know to avoid the evil of Satan and to pursue the goodness of God.
In other words, since we rejected the easy way in the garden, we now have to learn the hard way not to do evil and to pursue good.