Hello, Arviddag.
There are nice unbelievers from all sorts of persuasions; Atheists, New Agers, Hindus, Muslims, Buddhists, etc, and you feel for them thinking about the possibility of their ending up in the wrong place in eternity. But the Lord did not send peace upon the earth but a sword, and warned that a our enemies would be those of our own household. The war we must fight is fought with words. Falsehoods speak out against truth, and truth exposes these lies to the deceived. This is why all who live godly in Christ Jesus will suffer persecution and opposition. They will be attacked for the words that in obedience they speak out of their mouths.
The lesson from Genesis to Revelation will be that history amounted to little more than a battle for the souls of men between the Lord Jesus Christ and Satan, the enemy of humanity. How can those whose words opposed the truth, or those who at best simply played no part in that war whatsoever but sat on the sidelines because they chose to believe something else have any reward when all is said and done? They didn't just miss a battle here or there, they missed the entire war.
That's usually my answer to that line of questioning.
God bless,
Hidden In Him