Will God be a just Judge when judgement comes at the end times?

Answer Request:
Will God be a just Judge in the future if He punishes unbelievers and sinners with a quick second death on the day of judgment that will last only a few seconds and minutes depending on how serious the sin is?

Each believer has a different interpretation of what happens after death and what it means to be cast into the lake of fire at the second death. Although I have my own interpretation on these issues I will not diverge into those details as they are irrelevant, irrespective of what interpretation one holds.

The bottom line to this question is not how quickly or not a person will last in the second judgement, or if it is an eternal hell of suffering or an instant destruction of the soul and lifeforce of that person. The bottom line is that God is not just ABSOLUTELY just, but that He is JUSTICE personified.

Every person throughout history will have had many "moments" occur in their life where they became aware of God and His existence, (Rom.1). They would have had the opportunity in that "moment" to choose life or death based on the knowledge of His existence, His love and His conviction in their heart of sin, righteousness and judgement.

The choice to live or die is made by the human. God's judgement is based on that choice.

Because of Jesus' substitutionary atonement on the cross, God can remain just in his judgment of the lost while still giving mercy to those who, by faith, have received the forgiveness of their sins. This is what Hebrews means when it says, "...without the shedding of blood there is no forgiveness of sins", Hebrews 9:22.

In Psalm 89:14, David writes,

Justice (righteousness) and judgment are the habitation (foundation) of thy throne: mercy and truth shall go before thy face.

Mercy and truth are the heralds that announce the coming of the Judge. His truth binds Him to fulfill all His declarations which are just; and his mercy shall be shown to all those who have chosen to trust in the hope and salvation that comes through the gospel He made known to them.