I don't think "secular" is even an issue here. Obeying the laws, claiming citizenship, and enjoying the rights bestowed because of it doesn't make one "secular." It makes one a "citizen." Are priests American citizens, or Baptists ministers? They are hardly "secular," but are still citizens.
Obeying the laws is much different from trying to eradicate them through bombs and conversion to Sharia.
I disagree. I think it is indeed an issue. Rabbis, Priests and Baptists can devoutly follow the teachings of their religions without coming into conflict of those not of their faith. With what I would guess are very rare exceptions, most Christian or Jewish sects do not preach lying in wait for people of other faiths and attacking them wherever you can. (Someone else here may be able to speak to that)
However, there is a segment of the muslim population, and not an insubstantial one, that believes that in an ideal world, according to the teachings of the prophet, you are either Islamic, submissive to Islamic rule, banished to somewhere else or dead.
While it is true that many devout Christians live their lives according to the teachings of the Bible, the teachings of the Bible are not considered to invasively rule the lives of its followers.
The Koran is different, at least according to a large portion of Muslims. It is considered a template or instruction manual on exactly how followers of Islam should conduct their affairs. For many, to deviate is apostasy, and as I said earlier, apostates of Christianity or Judaism have a very, very different burden (at least in this world) than apostates of Islam.
So I do think it IS an appropriate issue to consider.