1 John 5:13: I write these things to you who believe in the name of the Son of God so that you may know that you have eternal life. If life is eternal, it cannot be lost. How can you have eternal life that lasts a year? You can't.

Catholics do not believe in once saved, always saved. Saved Christians have the freedom to fully reject God and their salvation. We call this mortal sin. 1 John 5:16-17 - 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. All wrongdoing is sin, but there is sin that is not deadly. Catholics believe: Mortal sin is a grave infraction of the law of God that destroys the divine life in the soul of the sinner (sanctifying grace), constituting a turn away from God. For a sin to be mortal, three conditions must be present: grave matter, full knowledge of the evil of the act, and full consent of the will. Venial sin is a sin which does not destroy the divine life in the soul, as does mortal sin, though it diminishes and wounds it. Venial sin is the failure to observe necessary moderation, in lesser matters of the moral law, or in grave matters acting without full knowledge or complete consent. But continual venial sin can slowly but surely totally separate you from God, placing you into the state of mortal sin. For more information, see the Catechism of the Catholic Church, sections 1854 and following: http://www.usccb.org/catechism/text/pt3sect1chpt1art8.shtml#1854 Were the 12 Apostles "saved"? Prior to his betrayal of Jesus Christ, was Judas Iscariot "saved"? The Bible seems to infer that Judas went to Hell: "Woe to that man who betrays the Son of Man! It would be better for him if he had not been born" (Mark 14:21). "Once saved, always saved" Christians would say "No, Judas was never really saved." Like the rest of the Apostles, Judas was called and chosen by Jesus and left everything behind to follow the Lord. He called Jesus "Lord" (Savior was still yet to come). For three years he followed the Lord with the other Apostles. These are the acts of a "saved" Christian. In Mark 6:7-13, Jesus sends forth the 12 Apostles (including Judas) and they "drove out many demons, and they anointed with oil many who were sick and cured them." How could an "unsaved" Judas accomplish this? Catholics would argue that Judas was "saved" when he was sent forth but that committed mortal sin when he betrayed Jesus and committed suicide. Luke 6:16 lists the Apostles "... and Judas Iscariot, who became a traitor." Judas was "saved" and through his own free will committed mortal sin and threw away his salvation. With love in Christ.

I believe the term used for this is apostasy.