Can a Christian ever lose salvation? Can someone who has truly been saved ever be lost?

I believe not. In the Holy Bible it is written that "I will never leave thee, nor forsake thee". Jesus will not cast you out. He said "him that cometh to me I will in no wise cast out". You are sealed until the day of redemption. "And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption". Ephesians 4:30. The Bible says that if a person "backslides" he shall suffer loss but he himself shall be saved. 1 Corinthians 3:11-15. What if we later believe not? Our salvation is so secured, even if we believe not after we're saved, because we become part of Him,"yet be abideth faithful: He cannot deny himself." What if we sin an awful sin? 1 Corinthians 5 reports of an awful sin in the church. And even though Paul commands "to deliver such an one unto Satan for the destruction of the flesh" Paul still speaks of that person being saved. We may foresake Him but he does not forsake us. What do you believe?