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Why would god, knowing full well what was going to happen anyway, set up an environment where he knew Adam and Eve would fail? Why would a loving god throw a tree in there that would kill his children? Why did god allow the talking snake to be there (never mind how obviously preposterous the notion of a talking snake is)? God knew what was going to happen, so he set the dominoes in place FOR it to happen. You can't honestly say that Adam and Eve knew the ramifications of their choice, given you yourself said they did not know what good and evil was yet. I guess that doesn't matter, though!
Second, God did not know Adam and Eve would sin. They were perfect. His purpose was for them to have offspring and "fill the earth. It was supposed to stay a paradise. When Eve CHOSE to sin. It was her decision. When Adam followed her, he proved that he loved her more than he loved the creator of all things, including himself. We all have the right to choose. Nothing is predestined. Everyone has freewill. They knew God was their creator and they knew they were suppose to obey him.. but they didn't which led to consequences.
The question is, 'Why do we need to know?' Perhaps it is to satisfy the premise of an abstract philosophical argument, one which some use as a smokescreen to justify their rejection of God and which acts like a floodlight for others, exposing their rejection of God to the core. But for us the question is much more practical and personal: How do I deal with the pain of sin, suffering, and death? Habakkuk asks the question, 'Why does God wait to deliver us?'
Habakkuk 1:13
Your eyes are too pure to approve evil, and You can not look on wickedness with favor. Why do You look with favor on those who deal treacherously? Why are You silent when the wicked swallow up those more righteous than they?
Habakkuk cries out in anguish, entreating God to come quickly to the rescue. Adding to that, the first thing to realize is that God is to be praised no matter the case; God has already gone above and beyond what He had to do, so what is wrong if He allows evil to befall us?
Job 1:21
He said, "Naked I came from my mother's womb, And naked I shall return there. The LORD gave and the LORD has taken away. Blessed be the name of the LORD."
Yet God chose to deal decisively with sin and death and bless us, making many promises to us as His people: promises to inherit the world, promises to be vindicated and delivered, promises that He will wipe every tear away from our eyes. And all the promises of God are "Yes" in Christ Jesus; each promise has been signed and sealed with the blood of the Lamb. And the pattern of that Lamb is suffering before glory, humiliation before exaltation, death before life, abandonment before rescue. So here and now we follow in His footsteps, but God's salvation waits ready to be revealed at just the right time. So we look past the perishable suffering of today and unto the imperishable life of tomorrow, and we can trust in God's promise absolutely because it has been declared to all mankind when He raised our Lord from the dead.
Romans 8:35-39
35 Who will separate us from the love of Christ ? Will tribulation, or distress, or persecution, or famine, or nakedness, or peril, or sword ?
36 Just as it is written, "FOR YOUR SAKE WE ARE BEING PUT TO DEATH ALL DAY WE WERE CONSIDERED AS SHEEP TO BE SLAUGHTERED."
37 But in all these things we overwhelmingly conquer through Him who loved us.
38 For I am convinced that neither death, nor life, nor angels , nor principalities, nor things present, nor things to come, nor powers,
39 nor height, nor depth, nor any other created thing, will be able to separate us from the love of God, which is in Christ Jesus our Lord.