I see your point - I agree that Muslim countries should also encourage migration. I think most Muslim countries do - but many Arab countries don't...
Islam is a religion. There are many Muslims who aren't 'eastern', 'arab' etc.
I also agree there is a campaign against Islam - some of it is religious, some of it is just that after the end of the Cold War a new enemy was required.. I recommend you watch a BBC documentary series called 'Power of Nightmares' - it is available on You Tube.
As for the position of Muslims in the UK - poorly paid jobs are mostly done by the newest immigrants which happen to be Eastern European (i.e. White) people at this moment in time. Poles, Czechs etc are working the building and service industries.
A couple of years back for example, only Indian/Pakistani workers would be waiters in the 'ethnic' Indian restaurants catering to immigrants (eg in Southall or Green Street). Now, there are Eastern European women working as waitresses in these cafes (I'm not talking about main restaurants, but small cafes etc that are usually mainly used by Indians!)
People of my age who happen to be Muslim do not fall into one category - but most of my peers are professionals or successful business men and women.
So, the last statement that 'most' muslims work in the service industry is one that I would challenge. I think you are perhaps confusing economic immigrants with 'muslims' - and even then you'll find that many are doctors and nurses etc.
That said, many people of my fathers generation did come and work in factories etc. However, their children have gone on to benefit from the education system and trade environment and bettered themselves. It is a pattern that was earlier followed by other immigrants - such as the Hugenots, Irish and Jews. East London is particularly interesting in this regard - as it has a long history of immigrants settling, doing well and moving out. The current area around 'Brick Lane' is now proudly labelled something like 'Bangla town' by the council and has popular restaurants and shops etc. Before the Bangladeshis, there were the Irish (I think) and certainly Jews - all working in the textile trade.
Cheers,
Shafique