If you are truly' born again then you need to repent of your rebellion against Him. It sounds to me that you didn't really know God though by the statement you made saying, " I did my best to do what was pleasing to him". Someone who is born again doesn't "try" to please God as if attempting to meet some standard by their efforts and then become disillusioned. That sounds like religion minus a relationship with Christ because in a loving relationship with Christ there is rest and peace and living a life that is pleasing to the Lord is a joyful desire.
In the bible, Yahweh accuses other gods of being crappy gods at the Council of El. Per your logic, He should return there and apologize for rebelling.
Of course he knew what was good and bad; he was created in God's image. And as a perfect creature, he was designed to always do good! He actual had to force himself to disobey. That's why the penalty was so heavy, and why the serpent (who was Satan -- Revelation 12:9) went to Eve first, being the easiest to deceive, and using her to get to Adam.
If being in God's image was the only necessary trait to know the difference between good and evil, there would be no need for a tree with magic fruit that gave those effects, right?
As was mentioned, they only had one prohibitive law. If they hadn't known good from bad, there would have been a lot more laws. "Don't beat the animals", "Don't pee in your food", etc.
And the penalty? He knew what death was. He had seen animals die. He knew what it meant!
Why didn't God kill them? Could it be because He cares about moral rationales and decided, as He did later with Cain, that no willful disobedience took place because you have to sin knowingly to sin? Otherwise, you're just an idiot who screwed up. They couldn't even handle the ONE law. Eve, who wasn't there when it was mentioned (she was created afterwards), adds "touching" when God said no such thing. Adam and Eve are idiots.
By what standards are we to judge God?
My answer is none. We're not capable, or worthy to judge Him and you even less so since you don't even know Him. All you can judge is second hand perceptions of Him, and if you actually cared about accuracy you'd realize that even if you could get a measure of understanding of Him you're way too biased to ever be trusted.
But as you believe the bible is God's Word, we are not getting "second hand perceptions" about morality. We are using the standards He Himself supposedly gave, like the standard that if I am unable to scream in a populated area when raped, I get to be murdered by authorities because I "should have screamed".
Free pass? Ego?
I'm not the one who thinks they can judge a being that is supposed to be omniscient and omnipotent and the Creator of the entire universe. I mean what size ego must you have to do that?
And one would imagine that a belief in God and the practice of prayer to Him and meditation on Him would give me somewhat of an edge when it comes to knowing Him.
And you never answered my first question. Why do we not follow the rules we give to our pets? Because we know better than them and they would eat their own vomit if we let them.
We're the pets, God's the owner. Like it or not.
FYI
Also here