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My brothers, do not fear that they left us (lost faith) for they were never of us (HAD FAITH) for if they were of us, they never would have left. but they left to prove they were never of us (paraphrased)
Jesus said, Even if we are FAITHLESS (lose faith) HE IS FAITHFULL, for he can not deny himself
You have yet to prove how ANYONE who has true saving faith in one who will NEVER LET THEM DOWN would lose that faith.
You need to stop thinking in human terms. Yes we lose faith in humans, because they let us down. Unless your going to claim God will let us down. You have not given any reason for anyone who TRULY knows their fate against a Holy God (which caused TRUE repentance) and has been saved FROM THAT FATE, would ever lose faith in that salvation.
The only people who would ever leave, are those who do not realise what they were saved from to begin with, why? THEY NEVER HAD SAVING FAITH!