This is a particluar problem in the Northern area of the UK.
The main question revolving this problem is:
What can be done about this and how can it be prevented?
Firstly, like 'Amrit' has stated, we Sikhs should stick in groups, by groups I do not mean gangs. Sangat is the word that comes to mind. This will let the Muslim Youths know that not ALL Sikhs are a divided lot. Alot of Muslims know more about Sikhi than 'Sikhs' do, they gain knowledge on the subject deliberately in order to twist it and display it in a repelling way to the person being converted.
Secondly, Rehat is a MUST. Without Rehat we are nothing, without keeping solid Rehat we cannot achieve enlightenment, therefore we cannot tackle the daily obstacles in life. Also, Guru Gobind Singh Sahib will not give us his full blessings, as Rehat is most dear to him, and NOT the Sikh. Simple Rehat includes Amritvela, Bana and other little things, all build up to one massive picture.
Thirdly, us people are dumping our identity for the apparently 'cooler' styles. Guru Gobind Singh Sahib has blessed us with Dastaar and Bana. We should make ourselves stand out of the crowd by proudly wearing this bana, but we should be spiritually strong so that our ego does not eat us away. We should also be Shastardhari and bear Sarbloh Shastar with us at all times.
Rehat Piaaree Mujko, Sikh Piaaraa Nahee.
Fourth and Finally, the most important aspect of our whole entire existence is NAAM, without Naam we do not even exist! The whole universe is held up with Naam-Divine. With Naam we are made fearless against the
opposition (Note: The Naam Abyaasee has no Enemy, the light of Vaheguru is imbued deep within all regardless)
With Naam nothing disturbs us.
There is also need of more Parchaar, to the youth. But I think this is getting on the way as there are plenty of Youth Camps for Sikhs to go to every year. But, the thing to worry about is if the Parchaar actually goes in and not out of the other ear.
Please Note that as Sikhs we do not hate Muslims or any other religion, as we see the jot of Ik Akaal in everyone, regardless of Religion, Caste, Creed or Colour. The Khalsa is such that it has no enemys, but it fights against anyone who does Beaadbee of Sikhi and the Gurus.
Gur Kee Ninda Suneh Naa Kaan.
We should remember all the Shaheedeeaa that Gurmukh Piaarai in the past have given for us, so that we might be here now to feel the glow of Freedom. We should Remember these and try and follow their example. Sometimes I cannot but think if there are any Sikhs of the True Guru who will give their head for him at any cost. Is there any true Sikh out there who can give their body to Satguru, just like those 13 Shaheeds did in 1978.
Sometimes instead of doing Parchaar we should just think about these things deep within ourselves and think if we are really following the examples of Satgurus and Shaheeds.
A quote comes to mind, 'Everyone thinks about changing the world, but no one thinks about changing themselves first.' - Something along those lines. It is a very interesting quote, of high decency in todays age of Kaljug.
More examples etc should be given towards the Youth, especially Girls of what Sikhs really are and what we are made of. Sikhi was made with Shaheedeeaa.
I hope to Satguru, I have not wasted my time typing this out.
Waheguroo Jee Ka Khalsa!
Waheguroo Jee Kee Fateh!!