Your entire argument fails right here and crashes to the ground
Eternal [aionios] life is Jesus Christ . He is the life and eternal life as scripture says and he is forever and eternal and everlasting in His being. And all believers have eternal life "abiding" in them, as they abide in Jesus Christ for he is eternal life.
"That which was from the beginning, which we have heard, which we have seen with our eyes, which we have looked upon, and our hands have handled, of the Word of life; 2 (For the life was manifested, and we have seen it, and bear witness, and shew unto you that eternal life, which was with the Father, and was manifested unto us 3 That which we have seen and heard declare we unto you, that ye also may have fellowship with us: and truly our fellowship is with the Father, and with his Son Jesus Christ."( 1 John 1:1-3 KJV)
Notice the "eternal [aionios] life" life is Jesus Christ.
"11 And this is the record, that God hath given to us eternal [aionios] life, and this life is in his Son."( 1 John 5:11 KJV)
"20 And we know that the Son of God is come, and hath given us an understanding, that we may know him that is true, and we are in him that is true, even in his Son Jesus Christ. This is the true God, and eternal [aionios] life."(1 John 5:20 KJV)
Eternal [aionios] life is actually Jesus Christ himself and if he is in us we are in Him which is eternal [aionios] life.
and so those who wilfully sin and do such things as this
"15 Whosoever hateth his brother is a murderer: and ye know that no murderer hath eternal [aionios] life abiding in him."( 1 John 3:15 KJV)
These no longer have eternal life (Jesus Christ ) abiding in them. Notice that Jesus Christ (eternal life) is
in a person or not. It is not an age as some make it in many instances but actually Jesus Christ himself. This could be the reason why some don't understand this and teach heresy because Jesus Christ ( eternal life ) is not in them . I would say to all to read this and consider,
"5 Examine yourselves, whether ye be in the faith; prove your own selves. Know ye not your own selves, how that Jesus Christ is in you, except ye be reprobates?"(2 Cor 13:5 KJV)
2 Corinthians 13:3
"Since ye seek a proof of Christ speaking in me, which to you-ward is not weak, but is mighty in you."
Context determines the meaning of a word. The same word can have more than one, or even many, meanings in different contexts.
So, to illustrate, if aionion means "eternal" in one context, it can mean a finite age or ages, epoch, era, millennium, lifetime, 3 days, long time, lasting, etc, in other passages.
In order to refute universalism you need to prove the word aionion means "eternal" when speaking of punishment. Arguing that it means "eternal" in regards to life proves nothing.
Universalists mostly agree that aionion sometimes means "eternal" & at others times it doesn't. Call that position A. And the following position B:
Some universalists, however, argue that in Scripture aionion never means eternal & that it always refers to an age, ages or a period of time that is finite. For more on that view see, for example, points 8 & 9 at posts 130 & 131 at:
What is the 2nd Death? (Annihilationsim vs. Eternal Torment)
Which leads us to the passage you refer to, 1 Jn.1:2, & the interpretation of the aforementioned "position B". It says Christ is life aionion, as 1 Jn.1:2 is to be understood. That doesn't mean that is everything Christ is. Christ is much more than that. After the aions end He will still be life, just as He was during the aions. He is both the life eonian and more than life eonian. He is life during the eons and life after the eons. So to say Christ is eonian life does not prove aionion means eternal. In fact, since the aions end, according to Scripture (Heb.9:26; 1 Cor.10:11), the eonian times (Titus 1:2, etc) must also end, as must eonian punishment (Mt.25:46). But since Christ & the saints will have immortality, incorruption, etc, their life will be endless.
BTW it's impossible for "life eonian" to be endless in the past because the eonian times had a beginning (Titus 1:2; Rom.16:25; 2 Tim.1:9). Are you going to argue that Christ had a beginning, too?
Christ Himself connected eonian life with the eon to come (Mk.10:30; Lk.18:30), yet Scripture speaks of multiple eons (ages) to come (Eph.1:21; 2:7; Lk.1:33; Rev. 22:5). So eonian life there can be understood to be restricted to a finite eon.
"In the Gospels there are instances where the substantive aion and the adjective aionios are juxtaposed or associated in a single image or utterance (most directly in Mark 10:30 and Luke 18:30). This obvious parallel in the Greek is invisible in almost every English tanslation" (p.540, The New Testament: A Translation, by EO scholar David Bentley Hart, 2017).
Considering Lk.18:30 above, ECF John Chrysostom limits aionios to a specific age of finite duration:
"For that his[Satan's] kingdom is of this age,[αἰώνιος] i.e., will cease with the present age[αιώνι] ..." (Homily 4 on Ephesians, Chapter II. Verses 1-3).
CHURCH FATHERS: Homily 4 on Ephesians (Chrysostom)
Also another Early Church Father by the name of Origen spoke of what is "after" and "beyond" aionios life. As a native Greek speaker & scholar he knew the meaning of the word:
"...in the one who drinks of the water that Jesus gives leaps into eternal life. And after eternal life, perhaps it will also leap into the Father who is beyond eternal life." (Comm. in Io 13.3)
Sometimes Eternity Ain’t Forever: Aiónios and the Universalist Hope
N.T. Wright is considered to be a leading NT scholar & his translation renders "life aionios" as "the life of God's coming age" (1 Jn.1:2, NTE). Compare:
Weymouth New Testament
the Life was manifested, and we have seen and bear witness, and we declare unto you the Life of the Ages which was with the Father and was manifested to us--
Young's Literal Translation
and the Life was manifested, and we have seen, and do testify, and declare to you the Life, the age-during, which was with the Father, and was manifested to us --
And the life was manifested, and we have seen and are testifying and reporting to you the life eonian which was toward the Father and was manifested to us. (CLV)
And, the Life, was made manifest, and we have seen, and are bearing witness, and announcing unto you, the Age-abiding Life, which, indeed, was with the Father, and was made manifest unto us; (Ro)
(and the life was manifested, and we have seen, and we bear testimony, and we declare to you the life the age-lasting, which was with the Father, and was manifested to us (Diaglott Greek-English interlinear)
...the AIONIAN LIFE...(Diaglott margin)
and announce to you the life of the Age...(The NT: A Translation, by EO scholar David Bentley Hart, 2017).
Indeed the Chayyei [Olam] was manifested, and we have seen it and we give solemn eidus (witness of testimony) and we proclaim to you the Chayyei Olam which was alongside with HaAv [Yochanan 1:1-4,14] and made hisgalus (appearance of, exposure of in revelation) to us [
Shlichim]. (OJB)
Speaking of OLAM, we now turn to Dan.12:2-3, which also supports the above position:
The context suggests the view that both the life & the punishment referred to in v.2 are of finite duration (OLAM), since v.3 speaks of those who will be for OLAM "and further".
2 From those sleeping in the soil of the ground many shall awake, these to eonian life and these to reproach for eonian repulsion." 3 The intelligent shall warn as the warning of the atmosphere, and those justifying many are as the stars for the eon and further." (Dan.12:2-3, CLV)
The Hebrew word for eonian (v.2) & eon (v.3) above is OLAM which is often used of limited durations in the OT. In verse 3 of Dan. 12 are the words "OLAM and further" showing an example of its finite duration in the very next words after Dan. 12:2. Thus, in context, the OLAM occurences in v.2 could also both be understood as being of finite duration.
Additionally, the early church accepted the following Greek OT translation of the Hebrew OT of Dan. 12:3:
καὶ οἱ συνιέντες ἐκλάμψουσιν ὡς ἡ λαμπρότης τοῦ στερεώματος καὶ ἀπὸ τῶν δικαίων τῶν πολλῶν ὡς οἱ ἀστέρες εἰς τοὺς αἰῶνας καὶ ἔτι[and further]
Notice the words at the end saying KAI ETI, meaning "and further" or "and still" or "and yet" & other synonyms.
eti: "still, yet...Definition: (a) of time: still, yet, even now, (b) of degree: even, further, more, in addition." Strong's Greek: 2089. ἔτι (eti) -- still, yet
εἰς τοὺς αἰῶνας καὶ ἔτι means "into the ages and further" as a translation of the Hebrew L'OLAM WA ED[5703, AD]
So this early church Greek translation of the Hebrew Scriptures agrees with the above translation (& those below) using the words "and further", "futurity", "beyond" & similarly.
3 and·the·ones-being-intelligent they-shall- warn as·warning-of the·atmosphere and·ones-leading-to-righteousness-of the·many-ones as·the·stars for·eon and·futurity (Dan. 12:3, Hebrew-English Interlinear)
http://www.scripture4all.org/OnlineInterlinear/OTpdf/dan12.pdf
2 and, many of the sleepers in the dusty ground, shall awake,—these, [shall be] to age-abiding life, but, those, to reproach, and age-abiding abhorrence;
3 and, they who make wise, shall shine like the shining of the expanse,—and, they who bring the many to righteousness, like the stars to times age-abiding and beyond. (Dan. 12:2-3, Rotherham)
2 And the multitude of those sleeping in the dust of the ground do awake, some to life age-during, and some to reproaches—to abhorrence age-during.
3 And those teaching do shine as the brightness of the expanse, and those justifying the multitude as stars to the age and for ever*. (Dan. 12:2-3, YLT)
* for "for ever" Young of YLT says substitute "age during" everywhere in Scripture:
http://heraldmag.org/olb/Contents/bibles/ylt.pdf
Dan. 12:2-3 was the only Biblical reference to "life OLAM" Jesus listeners had to understand His meaning of "life aionios"(life OLAM) in Mt.25:46 & elsewhere in the New Testament.
Verse 3 speaks of those justifying "many". Who are these "many"? The same "many" of verse 2, including those who were resurrected to "shame" & "contempt"? IOW the passage affirms universalism?
Have you been decieved by your Bible translation?
For the Lord will NOT cast off FOR EVER:
Augustine's ignorance & error re Matthew 25:46
Church Fathers & Universalism since Early Church times
Is there salvation after death?
If endless conscious torments were true, is God a monster?
If endless punishment were true & victims of infanticide all go to heaven