We can sling verses all day long. Here you go. It is a GIFT.
For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord.
For by grace are ye saved through faith; and that not of yourselves: it is the gift of God:
All you have to do is believe:
For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
It is not revoked:
My Father, which gave them me, is greater than all; and no man is able to pluck them out of my Father’s hand.
And you cannot earn it or keep it by works:
Not of works, lest any man should boast.
It brings peace:
Therefore being justified by faith, we have peace with God through our Lord Jesus Christ
It is human folly to think they can “earn” or “keep” salvation. If you have accepted the Gift of Christ’s sacrifice for your sins, it is written.
You can certainly lose your faith, but that will only impact the maturity you will experience in this earthly walk. You will miss out on the peace and grace that God bestows. But it will not result in your losing your salvation. You will just remain a stunted child in that salvation. If you read the Old Testament, it is a blueprint for salvation. God may have chastised the Hebrews when they turned their backs on Him; but they remained His chosen people.