BERLIN - One German in eight would join an anti-Muslim march if a rapidly-growing protest movement organized one in their home towns, according to an opinion poll published on Thursday.The survey highlighted growing support in Germany, as in other European Union countries including Britain and Sweden, for parties and movements tapping into voter fears that mainstream politicians are too soft on immigration.Some members of Chancellor Angela Merkel's conservative bloc worry that they risk losing support to the euro-skeptic Alternative for Germany (AfD) party, which has shifted its focus to immigration, and many of whose members back the PEGIDA protest movement -- Patriotic Europeans Against the Islamisation of the West.