Why are believers still afraid of death?

[WinterHold]

I don't know.

I blame the bad deeds of most humans. Check this verse from the Quran:

Sura 62, The Quran:
( 6 )   Say, "O you who are Jews, if you claim that you are allies of Allah, excluding the [other] people, then wish for death, if you should be truthful."
( 7 )   But they will not wish for it, ever, because of what their hands have put forth. And Allah is Knowing of the wrongdoers.

People know what they did in their lives, even if they claimed innocence. In other words; a sinner is not fooling anybody.
Don't believe somebody who gets up on a high horse and claim pureness, even if they hide behind institutions like the Catholic Church, or a dome like the Islamic Azhar Mosque, or an invaded ex-Muslim temple turned Jewish in Palestine.

In different words: I think real believers know their true deeds, so they're embarrassed from many of them; and know it might lead them straight to hell.
Or at least to some kind of torture by God upon death.

That is scary.
And ironically hilarious and sad when you consider theistic ways of belief like the Islamic Shiite/Sunni promise of heaven for followers of the sect, Catholic "messiah"/"Confession" concept, and Jewish "God's chosen people" stuff...It makes you think deeply.