Question: What about the doctrine of the fall? When Adam sinned the universe changed and bad things started to happen, like disease and disasters, earthquakes and famine. God didn’t originally make the world like that.
Answer: Our fallen nature is mentioned in 'Genesis for Ordinary People' and looked at. However, a thorough look at "Original Sin" and "The Fall" is covered in my book 'God and Primordial People'. But for this web site let's say that Adam fell, as we have all fallen, and there are consequences to choosing evil over good.
First, it’s important for us to remember that doctrines are formulated by men. For instance the doctrine of the fall and original sin are viewed differently in the western church and eastern church. And there is a range of Christian thought about how our fallen nature affects us. Take Gregory, the 4th-century Archbishop of Constantinople, he is well known as a Trinitarian Theologian and still influences modern Christians, Gregory taught that infants are born without sin. However, most theologians recognise that humanity has a flaw. Jesus himself made it quite plain: "He did not need anyone to testify concerning man, for He Himself knew what was in man" (John 2:25). We conclude that: according to Jesus, something sinister lurks within us.
Augustine helped develop the doctrine of fallen humanity. It seems that since Irenaeus (in the second century) started talking about the subject of sin resulting from the fall of man, the doctrine has had a spectrum of adherents, from some who think our fallen nature is a slight deficiency, to others who say we are totally depraved. The truth seems to lie somewhere in the middle. We are marred, we have a fault. God told Jeremiah to go to the potter’s house and watch him work. The potter marred the first pot that he was making so he made another pot from the same clay. That’s a good picture of fallen humans, we must be born again because the life we have from our first birth has been marred, so we need, as Jesus put it, new wineskins because the old ones will crack.
Humans have a tendency to veer off-course; we are free agents who can become our own despotic gods. Moses pointed out that “They are not His children, because of their defect” (Deut 32:5). The King James version translates “defect” as “spot,” which is the Hebrew word, too. Humans are marred with a spot or blemish. The reason we have a tendency to veer off-course is because the “spot,” or the "law of sin and death," is at work in our lives. Originally: "God created mankind upright, but they have gone in search of many schemes" (Ecclesiastes 7:29). A piece of fruit that has a blemish will start to erode and rot from that point - Sin works its way through us starting from our blemish.
Paul says, "Although they knew God, they neither glorified him as God nor gave thanks to him, but their thinking became futile and their foolish hearts were darkened" (Romans 1:21). "Therefore God gave them over in the sinful desires of their hearts" (Romans 1:24). That's our fallen nature; we have been "given over" to our sinful desires. Jesus was the only one who was born without the “spot”. He is without spot or blemish. Faith in Christ saves us from the law of sin and death, and the "futile way of life inherited from your forefathers" (1 Peter 1:18). - Jesus had a human mother but not a human father, so he shared in our humanity but did not inherit the flaw or blemish the rest of humanity has. The human "heart is deceitful above all things and beyond cure" (Jer 17:9). Jesus was crushed, bruised and killed because of the flaw. Humanity needed to be thrown out and discarded and Jesus did that on our behalf and was able to because he shared our humanity.
Moving on to the state of the universe: Let’s remember that even before humans had learned sin God did not make the world free from sharp corners where humans could hurt themselves, there are cliffs that a person may fall from, there are accidents waiting to happen if we don’t use our reason and try to negotiate difficult situations carefully; we may get injured or injure someone else. The first humans could get hurt just as we can get hurt. Responsibility is given us as a part of being made in God’s image. Let’s say someone is cutting down a tree but doesn't bother to warn anyone and someone gets hurt when the tree falls. That would be a result of someone not being responsible. A person's fallen nature has resulted in someone being injured. Or deceit will hurt people who thought they could trust each other, relationships fail because of infidelity. The tangled web we weave leaves a trail of pain in its wake. So in that sense, human sin has made the world a more treacherous place to live - There are also micro-organisms that can spread among humans. An explosion of bacteria may occur, sometimes caused by human behaviour that facilitates a disease through unhygienic practices; and other times we’re not sure what brought a disease among us. Or an earthquake may devastate an area. Plus war, criminal behaviour and hundreds of other things go wrong that stop life on earth being as God wills. All of the trouble in the world cannot be attributed to human agencies but some of it can. God allows other things for his own reasons.
The doctrine of the fall includes - "we reap what we sow", and God uses the physical world as a reflection of our spiritual state. He teaches us spiritual truths through the mirror of the material world. (I explain this in my book Fishing for Praise). The present universe shows us that all is not as it should be; that includes the state of the human soul. We see that man is born to trouble but the trouble can also teach us important lessons. If someone is ill then those who are well have an opportunity to show love and care for the sick person. If there has been a natural disaster then the surrounding people have a duty and responsibility to show care, help and love to those affected.
The danger in the universe alerts us to the fact that humanity is not in the eternal home that God has made for us, we are not ‘there’ yet. The danger and trouble shows us that this universe is temporary. The trouble also allows us to see that we need help, each one of us can cry out to God. Trouble can be what CSLewis called a "severe mercy". That we see things go wrong, and sometimes disastrously wrong, helps warn us of our need.
Jesus has gone to prepare a place for us where disasters, disease and death will be no more. We are presently living in what John in Revelation calls the "old order of things." At present, evil is in the world and creation groans under the weight of reflecting that fact. The universe is predisposed to react negatively to evil; God created it that way. God saw that all he had made was "very good" and part of that goodness was an inbuilt alarm - if humans took an evil course, creation would alert us that something was amiss. Part of the message in Romans 8 is that creation groans under the weight of evil that's done.