Is there a verse that says this? Please share. Otherwise, this is just your opinion.
Scripture says this:
John 5:24 - “Very truly I tell you, whoever hears my word and believes him who sent me
has eternal life and will not be judged but has crossed over from death to life. The word "has" is in the present tense.
John 6:47 - Very truly I tell you, the one who believes
has eternal life. Ditto.
John 10:28 - I give them eternal life, and
they shall never perish; no one will snatch them out of my hand.
iow, it is by the work of Christ, by giving eternal life to believers, that they shall never perish.
Again, refuted by Scripture itself.
Eph 1:13,14
13 And you also were included in Christ when you heard the message of truth, the gospel of your salvation. When you believed, you were marked in him with a seal, the promised Holy Spirit,
14 who is a deposit guaranteeing our inheritance until the redemption of those who are God’s possession—to the praise of his glory.
Eph 4:30 - And do not grieve the Holy Spirit of God, with whom you were sealed for the day of redemption.
Can you explain how a believer who grieves the Holy Spirit is STILL sealed for the day of redemption? And note the verse doesn't say "the day of judgment".
The verses above prove that Scripture does NOT teach anyone how to "remain in Christ". Our sealing is by the Holy Spirit, and no one is stronger than the Spirit, and no one can break this "seal".