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http://www.gotquestions.org/Christian-lose-salvation.html

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A Christian cannot lose salvation. Most, if not all, of what the Bible says happens to us when we receive Christ would be invalidated if salvation could be lost. Salvation is the gift of God, and God’s gifts are “irrevocable” (Romans 11:29). A Christian cannot be un-newly created. The redeemed cannot be unpurchased. Eternal life cannot be temporary. God cannot renege on His Word. Scripture says that God cannot lie (Titus 1:2).

Two common objections to the belief that a Christian cannot lose salvation concern these experiential issues: 1) What about Christians who live in a sinful, unrepentant lifestyle? 2) What about Christians who reject the faith and deny Christ? The problem with these objections is the assumption that everyone who calls himself a “Christian” has actually been born again. The Bible declares that a true Christian will not live a state of continual, unrepentant sin (1 John 3:6). The Bible also says that anyone who departs the faith is demonstrating that he was never truly a Christian (1 John 2:19). He may have been religious, he may have put on a good show, but he was never born again by the power of God. “By their fruit you will recognize them” (Matthew 7:16). The redeemed of God belong “to him who was raised from the dead, in order that we might bear fruit for God” (Romans 7:4).

Nothing can separate a child of God from the Father’s love (Romans 8:38–39). Nothing can remove a Christian from God’s hand (John 10:28–29). God guarantees eternal life and maintains the salvation He has given us. The Good Shepherd searches for the lost sheep, and, “when he finds it, he joyfully puts it on his shoulders and goes home” (Luke 15:5–6). The lamb is found, and the Shepherd gladly bears the burden; our Lord takes full responsibility for bringing the lost one safely home.
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