Under the Old Covenant, under the law, the Israelites couldn't murder. We couldn't even be angry. They couldn't commit adultery. We couldn't even have a lustful thought. If you're right, then we lose our salvation by doing less in following the law than the Israelites did!
Is this really the Good News of Jesus Christ? Are these the riches of His Grace, that we have to live in fear of sinning? Are we saved by grace only to be placed under the constraints of an even more severely administered law?
And what of Romans 8:29-30, which says that God predestined those whom He foreknew to be conformed to the image of Christ. If we can lose our salvation and, thus, our conformity to the image of Christ, then does this mean that God's foreknowledge is wrong? That's open theism, which has historically been condemned as heresy by the Church.
How about Jude 24, which says that Christ is able to keep us from falling? If we can lose our salvation, does this mean that Christ is able to keep us from falling, but is merely unwilling? How is that consistent with the Biblical description of Christ?
What do you make of Colosians 3:1-4, which promises that if we have been save, we will appear with Christ in glory? It doesn't say "you might appear with Christ in glory, if you don't lose your salvation". It says "you will appear with Christ in glory". Done deal.
Philipians 1:6 promises us that if Christ has begun a good work in us, that He will finish it. How does He keep that promise if you believe you can lose your salvation?
How do you explain 1 Peter 1:23, which tells us that when we are born again, we are born of incorruptable seed? If we can lose our salvation, then this seed is corruptable and that promise is not true.
Like Colosians 3:1-4, 1 John 3:2 says that we are sons of God now and that when Christ appears, we will be like Him. There is no qualifier. There is no "...if we don't lose our salvation".
Titus 1:2 says that God has promised us eternal life and that He never breaks a promise.
In John 10:27-29, Jesus promises us that He has given us eternal life, that we will never perish, and that we are not only in His hands, but in the Father's hands. How is Jesus' promise in John 10:27-28 consistent with the idea that we can lose our salvation? Is Jesus really incompetent to keep those whom the Father has given Him?
John 5:24 says that if we are saved, we will not come into condemnation but will have eternal life? How can Jesus promise that we will not come into condemnation if He knows we can lose our salvation?
Romans 11:6 tells us that salvation is not by works. If we cannot be saved by works, then how can we lose our salvation by works?
John 14:16-17 tells us that when we are saved, the Holy Spirit indwells us forever. How can the Holy Spirit indwell in us forever if we lose our salvation? Since when does the Holy Spirit dwell in the unsaved?
Ephesians 1:13, 4:30 tells us that we are sealed unto the day of redemption. If we lose our salvation, then how can we still claim to be sealed?
1 Peter 1:4 says that our salvation is "imperishable, undefiled, and unfading". If our salvation is imperishable, how can we lose it? If our salvation is promised by God to be undefiled, how can we defile it?
I would strongly encourage you to reconsider your denial of the Biblical doctrine of eternal security and its logical and Biblical consequences.
