Out With The Old In With The New
Our Sin nature (being born spiritually disconnected from God and in rebellion to Him and predisposed to disobey) is passed on from Adam through every male to all humankind. According to God’s Word it’s because Adam was not deceived when he consciously disobeyed God’s 1st command not to eat the fruit of the knowledge of good & evil as Eve was. That act brought the curse of rebellion & death on all mankind and put us all at enmity with God.
Since there can’t be any human being without a father’s DNA, all humans from Adam on are born with this nature, except for Jesus who was formed in Mary’s womb by the Holy Spirit, making Him a human man without our Sin nature. That did not mean that He couldn’t sin though. Like Adam before he chose to disobey, Jesus could freely choose to obey or disobey, and He chose to always obey the Father even to the point of death on the cross as a willing sacrifice, hence He was sinless by choice. Through that sinless death He was able to do what Adam should have done for Eve, but didn’t.
When Jesus willingly sacrificed Himself, he fulfilled the law of God’s just nature and not only freed all of us from our Sin nature, he also overcame death in order for us all, through faith in Him, to be able to receive both His righteousness and His eternal life. These are imparted to each person when they repent of their rebellion against God and accept Jesus Christ and are born of God’s Holy Spirit, giving us a new nature – God’s Holy nature, so we are now able to choose day by day to be obedient like Jesus, or disobedient like Adam.