Quite, and completely underestimates their level of popular support on the ground. Same with Hamas. They are both mass movements, and some of the most politically progressive mass movements in the Middle-East today.
As far as 'chasing the BNP out of Dagenham' is concerned - I wouldn't be surprised if that could have been the perception from a few naive student Swappies on the ground... Since Lewisham, the Fascists in Britain have a relatively well documented tradition of running a mile from physical confrontations with the Reds apart from on the most important occasions (Griffin's trial). Of course, I don't think they did chase them out - nor does anyone who knows anything about the politics of the community of the area - but the demo may well have stopped the BNP from organising anything else new.
As far as the SWPs allegiance to religious groups is concerned;
a) it's important to appeal to the radicals (the majority of Muslim youth) because they are the one's closest to our understanding of the State and capitalism - many simply find their criticism taking religious tones. We hope (and in many cases succeed (already cited examples from Muslim Respect members in Preston) in doing this).
b) we haven't, to date, allied ourselves with any organisations which don't have mass and popular support amongst Muslims in Britain, and without good reason. There are many reasons to support Hamas, not just because they're popular. I'm sure you've heard the arguments before, and I have (on a previous thread) gone into the programme of Hamas and Hizbollah and shown that they are politically progressive organisations.
c) we've not being making our allegiances with the 'right wing conservative' elements of the Muslim community... I don't know what you know about the demographic of Muslim Respect members but they are (without exception) the most progressive and forward looking members of the community. I have never met any Muslim Respect members who would show me this is otherwise. Making relations with the Mosque may well be making relations with conservatives, but it's also an act of bridging the divide between the insular and exclusive communities of the most marginalised Muslims with the rest of British society.