I thought you were writing about gangs? Now it's ISIS. Or magistrates, or the yakuza, or whichever group has the least women possible as members. But you keep insisting that there must be exactly 90% male main characters, except if the leads are ISIS fighters (asexuals apparently, because that's accurate) then it must be 100% men. I guess the kurds or Israeli army would be much less interesting, because there are waayyy too many women there, and that's a no-no. And the story features a made up war.

Concern trolling about historical accuracy as a veneer to exclude women from a fictional story us pretty sexist, yeah. I think you are pretty sexist yourself.

Good luck to writing either way.