Actually, so far, your reference to the seed is the only thing that cannot be taken from us which I agree, but scripture puts it on us to grow roots by studying in His words.
And that's what believers do since the seed never leaves them, 1 Jhn 3:9
You can't fall from the faith (noun ) unless you had the faith.
1 Timothy 4:1-2 has been prophesied and is happening today by saved believers seeking to receive the Holy Spirit apart from salvation after a sign.
Let me know if you see the contradiction (of non-osas) in the Synoptic Gospels of aphistemi...
Matt 13:21 (does not use the word believe) (it uses trouble/persecution)
Mark 4:17 (does not use the word believe) (it uses trouble/persecution)
Luke 8:13 (uses the word believe) (aphistémi/depart)
Rom 8:35, 38-39 (nothing can separate us, even trouble/persecution)
1 Tim 4:1 ( aphistémi/depart)
Matt 13:21 But since they have no root, they last only a short time. When
trouble or persecution comes because of the word, they quickly fall away.
Mark 4:17 But since they have no root, they last only a short time. When
trouble or persecution comes because of the word, they quickly fall away.
Luke 8:13 Those on the rocky ground are the ones who receive the word with joy when they hear it, but they have no root.
They believe for a while, but in the time of testing they fall away.
Rom 8:35, 38-39 Who shall separate us from the love of Christ? Shall
trouble or hardship or persecution or famine or nakedness or danger or sword? 38For I am convinced that neither death nor life, neither angels nor demons, neither the present nor the future, nor any powers, 39neither height nor depth, nor anything else in all creation, will be able to separate us from the love of God that is in Christ Jesus our Lord.
1 Tim 4:1 The Spirit clearly says that in later times
some will abandon the faith and follow deceiving spirits and things taught by demons.
Luke 8:13 / Gill's Exposition of the Entire Bible - which for a while believe: their faith is a temporary one,
like that of Simon Magus; which shows it is not true faith; for that is an abiding grace, Christ, who is the author, is the finisher of it, and prays for it, that it fail not. The Persic version renders it, "in the time of hearing they have faith"; and such sort of hearers there are, who, whilst they are hearing, assent to what they hear, but when they are gone, either forget it, or, falling into bad company, are prevailed upon to doubt of it, and disbelieve it. The Arabic version renders it, "they believe for a small time";
their faith do not continue long, nor their profession of it, both are soon dropped: