That's a good question the Bible teaches us that God is holy and righteous and just and he doesn't make any mistakes creation that tells us that creation was made perfect but when man brought sin into the world he brought death just as God told him he would if he disobeyed the Titan the New Testament teaches that death comes because of sin and that God doesn't send that man chose to disobey God and sin he chose to obey Satan and disobey God and sin brought death into the world we know that we all sin we know that we choose to keep on sending even having received Sin from our parents Jesus Christ came and died on the cross and took our sins upon himself and yet people still do not turn to him for forgiveness and repentance of their sins he will help to help us to be born again just as he said and John chapter 3 and also in the Book of Romans it talks about Sin and being born again it's all through the New Testament really I could go on and on Jesus Christ came to save sinners that's what we are and that's why we have pain and suffering and death because sin brings death