"we all llive harmoniously together generally" seems entirely correct. The word 'generally' is important, as their are always a few nasty people trying to stir up hatred but that doesn't prevent the vast majority of us living harmoniously together.
What we should resist is people coming to Lewisham trying to stir up hatred and possibly attack religious institutions, as has happened in incidents across the country (60 EDL rallies planned for this weekend spewing more hatred).
I'm still trying to find out if there is any point going to Lewisham Islamic Centre tomorrow to show solidarity with the local Muslim community against any possible attempt to illegally march there by the BNP.