Pretty much.
Now, we’d be unfair if we didn’t give due note that Islamic observance carries on at multiple levels.
Some are relatively passive, and can live for years, decades alongside Westerners minding their own private Islamic business and it never goes further.
But again there are the aggressive, who are fundamentalist about it and who actively cherish a world conquest view.
And when the aggressive get moving in the view of the passive, the passive tend to start coming along too.
Evangelism to the passive might be the only practical answer — to head them off from becoming resources for more active mischief. But this is going to take a gutsier Christianity than we commonly see today.
But also we have to remember that God never primarily sets up evangelism to be the answer to worldly demographic woes (though it may in fact prove to bestow such blessings). We can’t put the cart before the horse or it won’t move any more.
The point when we really are putting God first is the point where we are going to see the most consequent blessings.