I am not sure about your full meaning when you say "not a one time event or confession" are you saying you have to be forgiven again after being saved?
If you don't abide in Him until the end, you will not be saved. Jesus expects complete loyalty to Him with our actions and word until the end.
Most protestants seem to believe OSAS doctrine. They believe you cannot lose your salvation. But Jesus does not say that. You will lose it if you don't abide in Him until the end.
sorry for redundancy.