Some Christians believe that God's eternal life cannot cease to exist (hence the word eternal) yet a Christians eternal life can.
Steaver, isn't that what Paul says to Timothy in this text?
2 Timothy 2:11-13
11 It is a trustworthy statement:
For if we died with Him, we will also live with Him;
12 If we endure, we will also reign with Him;
If we deny Him, He also will deny us;
13 If we are faithless, He remains faithful, for He cannot deny Himself.
Please understand I do not believe God arbitrarily says, "I caught John/Jane Doe in the movie theater; therefore I withdraw their salvation." or "Brother Doe missed church 5 weeks in a row, or coveted, or (fill in the blank); they re out of here." I also understand that perseverance is directly tied to irresistible grace and I respect your position, however:
2 Timothy 2:10 For this reason I endure all things for the sake of those who are chosen, so that they also may obtain the salvation which is in Christ Jesus and with it eternal glory.
Let's not argue the word
chosen for that poor word has been beaten to death a thousand times on this board. The writer establishes the context of enduring or persevering. He says he endured or suffered so that others could obtain salvation.
Then his trustworthy statement:
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- For if we died with Him, we will also live with Him</font>
Amen!
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- If we endure, we will also reign with Him</font>
Endure Strongs 5278 to stay under (behind), that is, remain; figuratively to undergo, that is, bear (trials), have fortitude, persevere: - abide, endure, (take) patient (-ly), suffer, tarry behind.
That's the same word Paul used in verse 10. He says, "I have remained, bore trials, had fortitude and persevered, abided, endured suffered for the chosen.
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- If we deny Him, He also will deny us</font>
Blessed 16, how'd Matthew get on the Roman road?

You quoted Matt 10:32. You have to include the next verse as well, Matthew 10:33 “But whoever denies Me before men, I will also deny him before My Father who is in heaven."
How do they deny Him? They do not remain or bear trials, they do not have fortitude nor persevere, abide or endure suffering.
You would say that those that deny Him after their "conversion" were never saved in the first place. I say they counted the cost of discipleship and determined it was too high.