Study carefully this in Romans 5:12-21

"Wherefore, as by one man sin entered into
the world, and death by sin; and so death
passed upon all men, for that all have sinned:
(For until the law sin was in the world: but
sin is not imputed when there is no law.
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.
And not as it was by one that sinned, so is
the gift: for the judgment was by one to
condemnation, but the free gift is of many
offences unto justification.
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.)
Therefore as by the offence of one judgment
came upon all men to condemnation; even
so by the righteousness of one the free gift
came upon all men unto justification of life.
For as by one man's disobedience many
were made sinners, so by the obedience of
one shall many be made righteous.
Moreover the law entered, that the offence
might abound. But where sin abounded,
grace did much more abound:
That as sin hath reigned unto death, even
so might grace reign through righteousness
unto eternal life by Jesus Christ our Lord."