Behold, I was brought forth in iniquity, and in sin did my mother conceive me. (Psalm 51:5 ESV)
Therefore, just as sin came into the world through one man, and death through sin, and so death spread to all men because all sinned - for sin indeed was in the world before the law was given, but sin is not counted where there is no law. (Romans 5:12-13 ESV)
Among them we too all formerly lived in the lusts of our flesh, indulging the desires of the flesh and of the mind, and were by nature children of wrath, even as the rest. (Ephesians 2:3 NASB)
What is a Zero-Day Vulnerability? According to this
website, "A zero day vulnerability refers to a hole in software that is unknown to the vendor. This security hole is then exploited by hackers before the vendor becomes aware and hurries to fix it - this exploit is called a zero day attack."
We sin, because we have a sinful nature. We indulge the desires of the flesh and of the mind, and were by nature children of wrath. Even babies, when they are born, the sin nature is already in them. They have Zero-Day Vulnerability.
Brothers, I tell you this: Flesh and blood cannot inherit the kingdom of God, and corruption cannot inherit incorruption. (1 Corinthians 15:50 HCSB)
Our fleshly bodies have sinned, and for the sins we have not committed, we may have Zero-Day Vulnerability for that sin. Thus we cannot inherit the kingdom of God. To inherit the kingdom of God, we need a new body, which is perfect, without Zero-Day Vulnerability. That is why we need to be resurrected with a new body.
So is it with the resurrection of the dead. What is sown is perishable; what is raised is imperishable. It is sown in dishonor; it is raised in glory. It is sown in weakness; it is raised in power. It is sown a natural body; it is raised a spiritual body. If there is a natural body, there is also a spiritual body. (1 Corinthians 15:42-44 ESV)
Do not believe in the lie that salvation can be achieved by good works. Good works cannot fix Zero-Day Vulnerability. A new body is needed.