"We, however, have chosen to disobey Him and sin against Him; all of us have done wrong and failed to do what is right." (Romans 3:23) We may not be more sinful than our neighbor, or we may be far worse than anyone we know, it does not matter. Either way, we are guilty before God. (1 John 1:8)
God is perfect, completely good, always right and fair. He cannot tolerate sin. He cannot simply overlook the fact that we have chosen to disobey Him. The Bible says "the wages of sin is death." (Romans 6:23) This means that the fair payment for our rebellion against God is death. It is the punishment that we deserve.