What caused the Spirit of God to depart from Adam, leaving him spiritually dead? Disobedience – sin. Now look at what 2 Corinthians 5:21 says, “For He (God) made Him (Jesus) who knew no sin to be sin for us, that we might become the righteousness of God in Him (Jesus).
Christ, who knew no sin, became sin, the sins of the entire world, and He gave us, those who choose to believe, His righteousness. So please don’t quote the Old Testament, trying to sound humble, that your righteousness is as “filthy rags!” Your were a sinner, but that’s not whom you have become. That saying was written in the Old Testament under the law by Isaiah 64:6. We became the righteousness of God through Jesus Christ under grace the moment we believed. When someone says that, it makes me think that they don’t understand the New Covenant of Grace. Christ took all our sin and gave us His righteousness.
How can we as Christians know for sure that we will never die spiritually as Adam did, even though we still commit sins after being born-again? Because the issue of the penalty for sin was put to an end at the cross through the precious blood of our Savior.
Christ died, then was resurrected; we die to sin and then are resurrected to new life, eternal life. This is how we know our salvation is secure in Him forever.
Too many times the Christian’s understanding of salvation is not so much wrong, it’s just too small. The Bible has much more to say about our salvation than just being forgiven of all sin.