Every religion across every continent has some sort of plan through which mankind can be reconciled to their Maker. Even secular humanism, that believes we evolved from the earth, promotes the idea that we need to make sacrifices for the sake of preserving Mother Earth. No matter who or what we believe our Maker to be, we all want to be acting appropriately according to our purpose.
The very premise that we must do something to be in line with our Creator's plan indicates that something about our existence is not complete. It would then follow that something is wrong with our existence. Many people decide that it is better to disregard the notion of a supernatural Creator, at this point. However, it is important to note that, whether you believe in God or not, even Darwin noted that nature is cruel. No matter what, cruelty exists, but it can be defeated.
The Bible teaches that the world is broken because people chose to disobey God. This is not the end of the story.
Because God loved His creation, particularly human beings, so much, He sent His Son into the world. Jesus, God's only Son, lived a perfect life. He showed us how God intended us to behave. He battled against the wickedness and the cruelty of the world. He suffered at the hands of the cruel world and was killed. But in His death, He conquered the evil that drives the world's cruelty. He was obedient to God, up until His very last breath and was brought back to life by the power of God.
It is from this point that we realized that Jesus needed to die for us, if we were to have any hope of being at peace with God. Mankind deserved God's wrath for breaking God's laws, but Jesus paid the price that our wickedness deserved.
We would have been God's children, if it were not for our disobedience. Instead, from birth, we are children of the devil. Despite this horrible condition, through Jesus' sacrifice, His death and Resurrection, we have been given the right to be adopted into the family of God, once again. By God's grace, we can be reunited with Him forever.