If you could lose your salvation, it begs the question of how God could have made such a mistake, as He sees ALL of the future perfectly. Does Jesus save someone He already foreknows He WILL eventually lose (an impossibility, according to Scripture)? Does Jesus not have the POWER to see through HIS salvation? Does God know the future or not? Does God not foreknow ALL He will do to make sure a saved person ends up with Him in Heaven?
WHO is it Scripture says "began a good work in you? And WHO "will bring it to completion at the day of Jesus Christ?" Scripture says that Jesus is both the Initiator and the Completer of our salvation - we merely, as blind beggars, have been provided a glorious opportunity to merely accept what has only been made possible through Him (our salvation). Does Scripture not repeatedly say that God wants us to come to Him, that He wants to save us? So if saving a person is God's desire (and He only made it possible through HIS criteria (faith and commitment to Jesus), and as He has made that possible (through the Cross), is God's desire to save then, in ANY way, dependent upon MAN??? Is this stated desire of the Lord of the Universe to save subject to the frailties and sinful whims of sinful mortals? If so, then God is not sovereign, is without the power to save, and has subjected His desires in the matter of salvation to humans. But GOD is the one who saves. Plus, Jesus protects our salvation to its fruition of Heaven!
Hebrews 7:25: "Consequently, HE is able to save to the uttermost those who draw near to God through him, since HE always lives to make intercession for them."
2 Timothy 1:12: "But I am not ashamed, for I know whom I have believed (Jesus!), and I am convinced that HE is able to guard until that Day (of Salvation) what has been entrusted to me."
John 17:9-16: "While I was with them, I (Jesus) kept them in your name, which You have given me. I (Jesus!) have guarded them, and not one of them has been lost except the son of destruction (Judas), that the Scripture might be fulfilled."