We just won't agree so there's no point. If you think Christianity and Judaism etc are as big a threat as Islam and sharia then fair enough. But I would urge you to look at the rules of the Quran and certainly the difference when it comes reformation. Then you can make an informed decision on Islamic laws being passed here.
The Muslims are not as unified as you give them 'credit' for. My city has (at least) 10% Muslims and they alone are hugely varied in their beliefs and many don't have an agenda beyond providing for their families and living with respect to their neighbours.
The most unifying thing of all Muslims is probably the value of
family. If Islam is to dominate Western Culture, it's only by the accident that they are more family-orientated than the modern Westerner is. They look after their elders, young parents remain together until at least the offspring are grown and generally the
unit of family is a constant. It's extended into business, and alliances with other families of similar faith are bonded by marriage, which extends more business.
That's all they're doing. We, the west, used to have such strong family ideals but they've been a killer sacrifice of the idealistic individualist movement of the late-60's (which I support) which has sadly morphed into a media-supported individualist consumer society dependent on capitalism (which I don't support). The state can do little but play along, tho' it gamely tries its best to offer advantages to families.
If, in 500 years time, the non-Muslim is outnumbered in Western lands simply by virtue of his
not focussing on the family, then why should we blame the Muslim? Tho' interestingly, young Muslim women feel empowered by the feminist-orientated society of the West, and I personally know of a few cases where young mothers have left their Arabic/Turkish husbands (I had relationships with two of them), taking their kids with them, because they feel the father's Quran-interpretation was too strict. The mothers remain Muslim, but with a softer, more holistic, interpretation.
In this aspect they're no different to Western single mothers, except they follow a spiritual faith. The problem with this faith is that for some people it can be so
addictive that their love of Allah becomes above all things, even family. They lose sight of the people in their lives because of their devotion to what they believe is
The Truth Of Everything. This leads to them following inane rules in pursuit of this devotion to their god.
This sensation is very common among most Muslims, but it's not unifying enough to actually attempt any sort of globalised movement. It's not the right kind of energy for that, it instead focusses more on the tiny circle of life they have: self, faith, family, friends, work, play.
The Christian Crusades had an altogether different energy way back when, it had a direct domineering vibe, and it's this kind of energy you need if you want to impose your own way of life upon a different land.
So at most you could argue that Muslims are attempting the invasion by
unconscious stealth, but even that doesn't add up, as their unity isn't binding enough for this to work in any respectable future-model I've seen.
Anyway, we can't stop immigration now, the capitalist society we've fed is dependent on it. Plus 5-10% of our population are already descendants of Muslim immigrants. The seed is already sewn, whatever that seed may be. UKIP aren't gonna change that.
That seed is clearly what Enoch Powell meant, with his
rivers of blood speech. But the blame (if we really are to point here) is in the devaluation of the family unit in Western capitalist society, and devaluation not by the state even, but by its own people, seduced by faux-individualism.