It is more than 0.1% who support Islamonazism. Some estimates from polls would estimate those willing to engage in violent jihad against the infidel as being 10%, and those who won't do it themselves but are supportive of it are even higher.
Of that .1 % half are females, mostly unsuitable for fighting or not allowed to; half are male; of which only a fraction are of age to fight- and of those of age to fight, some are physically or mentally unable.
Of those remaining a large number will wet their britches in their first fight, and a large number just won’t be good at it.
The only reason there are so many muslims is that most are afraid to be anything else but are counted as true believers because their muslim country will not accept any other answer on the “census.”
You’re missing the author’s weasel word.
“Justice”
The Muslim idea of justice is crucifying Christian children.
So the author can use that 999.1 bs.