To the confusion, the controversy, the mixed messages, and inconsistencies already mentioned add the inconsistency of losing justification/salvation through mortal sin; if one can lose his right-standing with God based upon his performance, how is that not works-based salvation?
How can it be confusion? I have read the Catholic Catechism many times, and there isn’t anything that is confusing about it. It maybe difficult to understand from a Non-Catholic Christian because they lack any formal understanding of Catholicism doctrines especially in the lines of salvation and justification.
Mortal sin came out of 1 John 5:16-17 , where John wrote that there is a sin that is deadly and not deadly.
1 John 5:16-17 said:
16. If anyone sees his brother sinning, if the sin is not deadly, he should pray to God and he will give him life. This is only for those whose sin is not deadly. There is such a thing as deadly sin, about which I do not say that you should pray.
17 All wrongdoing is sin, but there is sin that is not deadly.
If you break this passage down. John speaks of a sin that is deadly? It is mortal sin. It takes away the sancifying grace that we gain in from our Christian baptism (Yes baptism does save see 1 Peter 3:21 This prefigured baptism, which saves you now. It is not a removal of dirt from the body but an appeal to God 7 for a clear conscience, through the resurrection of Jesus Christ, ). But that is another topic.
Let us move on with the current topic. How is sin deadly? It destroys the grace which we merit in our Christian baptism. By commiting sinful acts such as fornication or abortion, the grace is gone. It can be only regain through repentance with a contrite heart.
If we read 1 John 5:17, All wrong doing is sin, but there is a sin that is not deadly. A sin that is not deadly is venial. It doesn’t remove the grace which we earn by Christian baptism. To illustrate my point, when a man robs 65 million dollars, it is a serious matter. He gets a longer sentence. A man who steals a candy bar will likely get a lighter sentence. As we can see, not all crime are the same.
Likewise, in mortal and venial sin it also works in the same way. When one commits an abortion it is more serious than a someone who makes a white lie.
Where do people who die in mortal sin go? Hell. How about venial sin? They go to a third place Purgatory, where their souls are purged. Remember nothing impure can enter into heaven.
Let us take a look at the Scripture concerning a place of purification.
Matt. 5:26,18:34; Luke 12:58-59
POINTS IN THE PASSAGES: Jesus teaches us, “Come to terms with your opponent or you will be handed over to the judge and thrown into prison. You will not get out until you have paid the last penny.” The word “opponent” (antidiko) is likely a reference to the devil (see the same word for devil in 1 Pet. 5:8) who is an accuser against man (c.f. Job 1.6-12; Zech. 3.1; Rev. 12.10), and God is the judge. If we have not adequately dealt with satan and sin in this life, we will be held in a temporary state called a prison, and we won’t get out until we have satisfied our entire debt to God. This “prison” is purgatory where we will not get out until the last penny is paid.
Matt. 5:48
POINTS OF THE PASSAGES: Jesus says, “be perfect, even as your heavenly Father is perfect.” We are only made perfect through purification, and in Catholic teaching, this purification, if not completed on earth, is continued in a transitional state we call purgatory.
Matt. 12:32
POINTS IN THE PASSAGES:– Jesus says, “And anyone who says a word against the Son of man will be forgiven; but no one who speaks against the Holy Spirit will be forgiven either in this world or in the next.” Jesus thus clearly provides that there is forgiveness after death. The phrase “in the next” (from the Greek “en to mellonti”) generally refers to the afterlife (see, for example, Mark 10.30; Luke 18.30; 20.34-35; Eph. 1.21 for similar language). Forgiveness is not necessary in heaven, and there is no forgiveness in hell. This proves that there is another state after death, and the Church for 2,000 years has called this state purgatory.