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"Those who leave their homes in the cause of Allah, and are then slain or die,- On them will Allah bestow verily a goodly Provision: Truly Allah is He Who bestows the best provision. Verily He will admit them to a place with which they shall be well pleased: for Allah is All-Knowing, Most Forbearing."
- Quran 22:58–59
Many Muslims take pride in the fact, hence the popularity of the "I have bought you men who love death as much as you love life" quote from https://en.m.wikipedia.org/wiki/Khalid_ibn_al-Walid to the Persian governor.
Plus the Houthis and the Afghanistanis aren't even the same race, since the Houthis are Arabs and the majority of Afghanistanis are not.
If it's anything like Christianity most Muslims could well be practising but not devout and fully committed to everything written in the Quran.
> it's hard to defeat people who believe dying in battle is a ticket to paradise
How about it's hard to defeat people in their homeland, when they are fighting guerilla-style and not fighting head-on. i.e. Vietnam.