Romans 5: 12-16
Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned: (For until the law sin was in the world: but sin is not imputed when there is no law. Nevertheless death reigned from Adam to Moses, even over them that had not sinned after the similitude of Adam's transgression, who is the figure of him that was to come. But not as the offence, so also is the free gift. For if through the offence of one many be dead, much more the grace of God, and the gift by grace, which is by one man, Jesus Christ, hath abounded unto many. And not as it was by one that sinned, so is the gift: for the judgment was by one to condemnation, but the free gift is of many offences unto justification.
Sin and suffering in the world come from freedom: both moral and natural. we see in Romans 5 that sin was in the world when there was no law but it was not imputed without the law. The sin comes from the freedom in which it was neccesary for God to create free, rational beings. For us to be truly free, rational creatures capable of loving God and loving each other, natural freedom is neccesary. There must be an environment or external world in which we can be aware of others, ourselves, and God. If that environment did not exist in a state of relative freedom, we would not be free and not capable of accepting God's love or loving God or others. Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned: (For until the law sin was in the world: but sin is not imputed when there is no law. Nevertheless death reigned from Adam to Moses, even over them that had not sinned after the similitude of Adam's transgression, who is the figure of him that was to come. But not as the offence, so also is the free gift. For if through the offence of one many be dead, much more the grace of God, and the gift by grace, which is by one man, Jesus Christ, hath abounded unto many. And not as it was by one that sinned, so is the gift: for the judgment was by one to condemnation, but the free gift is of many offences unto justification.
Many times Romans 5 is used to show that Adam was a real person in history but that is missing the main point of the passage. We are new creations in Christ because that is where our eternal life lies. We all die in Adam because Adam represents our earthly life and denotes mankind in Genesis. Sin comes from freedom and it was in the world before the law. We are in a process of becoming (individually and collectively) what God wants us to be and that can only be done if there is freedom and room to grow.
If we as Christians accept that we have the freedom to make our own moral choices, then why is it so difficult for some to accept this very same freedom as the method of our biological origin?