I don't understand what you mean when you say that everyone is born into one or the other classification (predestined vs. free will).
What's there not to understand?? I thought that I was very clear in that everyone is born in the flesh with souls that are EITHER 'predestined' OR that have 'free will'.
Anyone that has studied the Bible would know that the terms 'predestined' and 'free will' are mutually exclusive of each other. It is clear [1 Pet. 1:20, Rev. 13:8, Rev. 17:8, and other places] that those souls, who are 'predestined', obtained that status for salvation before the "foundation of the world", which means, irrespective of how one wishes to interpret it, at a time before they were even born in the flesh and exercised any level of flesh 'free will'. It is also very clear [Joh. 3:16] that whomsover comes into belief, through 'free will', will also obtain salvation. It is purely a tradition of man, through lack of knowledge in the Word and bible illiteracy, to combine 'predestination' and 'free will' into some combo-theory. Such combo-theories are easily disproven by the scriptures that I have listed.
Now, I suggest that you don't take my word for it. If the listed scriptures are not dispositive for you, perhaps the Word from Jesus' own mouth might convince you of the two separate classifications for salvation.
Joh 6:39
And this is the Father's will which hath sent me, that of all which he hath given me I should lose nothing, but should raise it up again at the last day
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Joh 6:40 And this is the will of him that sent me, that every one which seeth the Son, and believeth on him, may have everlasting life: and I will raise him up at the last day.
Joh 6:40 And this is the will of him that sent me, that every one which seeth the Son, and believeth on him, may have everlasting life: and I will raise him up at the last day.
Unless you believe that Jesus had a speech impediment and was not the perfect Lamb of God, then His own Words inform us that there is a group of 'predestined' people that were "given" Him and another group with 'free will' that who "seeth the Son" and "believeth on Him" that, on the "last day", will be saved.