Process of elimination, especially in today's time, we can safely eliminate unborn infants from the Cross forward as they cannot confront the agape of the Truth, at IIThess.2:10b, hence not receiving "error's working" ergo most likely in heaven.
Born infants to ol' old timers like myself that also have never confronted the, agape of the Truth, at IIThess.2:10b, hence also not receiving "error's working" ergo most likely are in heaven or going to end in heaven since the Cross.
Those few infants to ol' old timers that understand the burden of the letter, ie, IIThess.2, in Truth, ie, opens up Rev.8:7-9:21, are absolutely in the Kingdom of God "outwardly" and God's call from heaven whether in "inwardly" upon one's passing ergo may or may not be in heaven.
This leaves the majority that have confronted the actual Truth at some point, whether verbal or documentation, and didn't have the agape of that Truth hence unknowingly receiving "error's working" ergo ending in hell.
All those Christians that really don't know whether they are saved or not most likely are saved, ie, to one's accountability. Ie, today's litmus test only.
Just ol' old Jack's eyes that are not doing well + sometimers and allstimers, but from my heart this time with no sarcasm - Hopefully the older pre-1929 Lutheran works, and myself, are in error hence I would know that I'm saved also, and really am saved from God's view. However I don't think so. btw the church is measured at Rev.11:1, ie, saved for those that hear the Trumpets blasting away and do something about it, ie, espcially the 5th and 6th Trumpets.