The UK is filled with Paki scum, probably the worst of the worse when it comes to Muslims. Come to Scandinavia and you'll find extremely few 2nd Muslims who are interested in imposing Sharia law. They either become more integrated (especially the women who opt more and more for Swedish husbands) or they become criminals. Here it's the 1st gen who are strongly opposed to their children leading a Swedish lifestyle, but their offspring are of a completely different mindset. Extremely few become devout Muslims. As for America, I'd say the situation is not as dire as it is in the UK. Also, it's a half-truth to say that 1st gens are less religious. They are just as devout as any extreme 2nd gen, but they often lack the means, the knowledge of the society they live in and the language to make their demands for Sharia, which is why they stay quiet. My experience in Sweden is that those who come here as adults are a hell of a lot more religious than any 2nd or 3rd gen immigrants. And as western countries keep bringing new immigrants in, any secular 2nd gens are going to drown in the flood of religious 1st gens.
Iranians are pretty much the only people where the 1st gens become almost completely secular the minute they step off the boat and their children have not become more religious, on the contrary, we are probably the best integrated "Muslim" group there is. Arabs and Turks from MidEast proper (not NA or South Asia) tend to follow but it takes a generation or so. Pakis have no soul so they don't count.
Add Scandinavia to the list of exceptions. Not even 1st gens attend mosque often here, let alone any 2nd gens. Stop fooling yourself. Britain's numbers are the odd man out. The major problem the west has with 2nd gens is that they have a higher propensity for criminal activities, not that they go to mosque every Friday. Another problem is the huge number of young 2nd gens who fear being married off or killed by their 1st gen parents if they don't abide by Islamic laws.