How did Sin enter the World?

         Romans 5:17 For if by one man's offence death reigned by one.  Much more they which receive abundance of grace and of the gift of righteousness shall reign in life by one, Jesus Christ.

         1)Sin entered the world through one person(Genesis  3: 17-19) 17 And unto Adam he said, Because thou hast hearkened unto the voice of thy wife, and hast eaten of the tree, of which I commanded thee, saying, Thou shalt NOT  eat of it: cursed is the ground for thy sake; in sorrow shalt thou eat of it all the days of thy life; 18 Thorns also and thistles shall it bring forth to thee; and thou shalt eat the herb of the field; 19 In the sweat of thy face shalt thou eat bread, till thou return unto the ground; for out of it wast thou taken: for dust thou art, and unto dust shalt thou return. 1 Corinthians 15:21 For since by man came death, by man came also the resurrection of the dead. 22 For as in Adam all die, even so in Christ shall all be made alive. Sin of Adam's guilt to all mankind(Genesis 6:5-12)  5 And God saw that the wickedness of man was great on the earth, and that every imaginary   thoughts of his heart was continuously evil. 6 And the LORD regretted that he had made man on the earth, and it grieved him at his heart. 7 And the LORD said, I will destroy man whom I have created from the face of the earth; both man, and beast, and the creeping thing, and the fowls of the air; for I regret that I have made them. 8 But Noah found grace in the eyes of the LORD. 9 These are the generations of Noah: Noah was a just man and perfect in his generations, and Noah walked with God.10 Noah begat three sons, Shem, Ham, and Japheth. 11 The earth also was corrupt before God, and the earth was filled with violence. 12 And God looked upon the earth, and, behold, it was corrupt; for all flesh had corrupted his way upon the earth. 1 John 5:19 And we know that we are of God, and the whole world was covered in wickedness.

       2)Because of sin, death entered into the world, and since everyone has sinned; we all fall short of God’s glorious standard. Genesis 2:17 But of the tree of the knowledge of good and evil, thou shalt not eat of it: for in the day that thou eatest thereof thou shalt surely die Genesis 3:23 Therefore the LORD God sent him forth from the garden of Eden, to till the ground from whence he was taken.

Because of God’s judgment, Adam was classified as a mortal human being and by this action, the spread of infectious diseases became rampant on the earth.

Paul said that by the perfection of the life of Jesus Christ, we have abolished the consequences of sin. The death of Christ has made man whole because he has sacrificed himself to abolish the consequences of Adam’s sin.

Romans 5:14 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.