2 Thessalonians 2:3, 10-12

Do not let anyone fool you in any way. That day of the Lord will not come until the turning away from God happens and the Man of Evil, who is on his way to hell, appears.

He will use every kind of evil to trick those who are lost. They will die, because they refused to love the truth. (If they loved the truth, they would be saved.) For this reason God sends them something powerful that leads them away from the truth so they will believe a lie. So all those will be judged guilty who did not believe the truth, but enjoyed doing evil.