“Salvation, however, can be lost if we continue to live in sin.”
Salvation can’t be lost. If one “continues to live in sin”, then he wasn’t saved in the first place.
John 3:16 - “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.” “Everlasting” means everlasting, starting with salvation. It doesn’t pop in and out. If God promises everlasting life, it’s continual from believing/salvation throughout eternity.
So we cannot have confidence that we are saved until the end of our life? For there have been many people who have proclaimed faith in Jesus Christ and have latter fallen into sin.