In looking at my petition, I saw another one that is really worth signing:
Stop Female Genital Cutting
It's about stopping Female Genital Mutilation. It doesn't say anything about Islam, but just getting rid of this hideous practice would probably help restrain Islamic encroachment. Even if it doesn't, stopping FGM is worth doing regardless.
This is one of those causes that can help force multiculturalists to choose between multiculturalism and human rights — a choice and a distinction that should be made. When they conflict, human rights should trump multiculturalism, as this issue makes crystal clear. If this hierarchy of values was clearer to more people, I believe much of the resistance we meet in telling people about Islam's relentless encroachment would evaporate.