I'm sorry to break it to you but your statement is invalid. You are commiting a No True Scotsman Fallacy. Born again Christians deconvert all the time, you're just presenting evidence that your understanding of John 10:28 is incorrect or that John 10:28 is incorrect.
"No True Scotsman is a
logical fallacy by which an individual attempts to avoid being associated with an unpleasant act by asserting that no
true member of the group they belong to would do such a thing."
http://rationalwiki.org/wiki/No_True_Scotsman
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