Islam does not have strong nationalism. It has a theocratic government. Nations mean nothing to them. ALL nations are to submit to their religious authority.
"Islam does not have strong nationalism."
You're simply arguing semantics, now. While true Muslims may claim not to recognize the so-called "nation-state" they certainly do recognize their own soverignty which they wish to preserve at all cost. No interlopers allowed. Hell, Iran is now an "Islamic Republic" with its own recognized borders.
Islam's so-called disenfranchisment with the "nation-state" is mearly a facade because of their diseffection with colonialism. However, when they were the imperialists, they didn't have such notions, as the Caliphates set up their own tribal regions. Call it what you want, but many in Islam still seek a Pan-Arabic "nation."
"Nations mean nothing to them."
Yeah...only because they think it is their right to annex other people's territory, borders be damned.