Are you saying we don't know if we will be rejected and told to depart from Him? or that we don't know whether others will? The former seems to fit the scenario of the passage, where they thought they would be accepted. Same for the pharisees, scribes, lawyers, priests, etc., that Jesus spoke to. They no doubt, assuming they believed in resurrection, thought they would be resurrected to heavenly bliss.
Jesus is saying depart from me to sinners
(Matthew 7:22-23) [22] Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works? [23] And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.
there is no verse saying a saved person will choose eternal damnation on judgement day
Saul when he was killing Christians believed he was doing the Lords work Acts 26:9-11
then
when Saul was saved he became Paul and had the holy Spirit that assured him of his salvation Ephesians 1:13-14
Romans 8:16 The Spirit itself beareth witness with our spirit, that we are the children of God
It's not just intellectual belief
Romans 8:38-39 [38] For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come, [39] Nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord.
Interestingly, neither do the wicked have an opportunity to choose death on resurrection day.
no they already chose before they died