Mixedmama, that is Islam in many Ismanic states and I think all Islamic states are fundamentaist ones. And Islamic states don't allow multiculturalism; there are people of other cultures and religions there, but they are marginal.
The worry Hirsi Ali has is that soon, due to the control of women within Islam, and therefore their fertility, very soon demographics will change withim European counties so that people of the Muslim faith will be the majority. This she argues is a political act.
After Muslims reach majority status they can start (in counties that have no seperation between church and state especially, like the UK) lobbying for things such as Sharia law. She is worried that a new Islamist facism will rise, and in turn a new Western facism - thsi is what she is trying to stop by wanting the issue addressed now, before the boys get too hot under the collar and spoil for a fight.
She talks about non pious Muslims, but as we see in current Islamist states, once a state becomes Islamist, fundameantalism rules, teh division between church and state collapses and any (critical) debate is seen as apostatism - leading to brain drain.
It is so tricky, as this debate would so easliy be hijaced by bigots, but that is no reason to have it.