By Ian Austen MONTREAL – Viewed separately, the incidents seemed relatively insignificant. Members of a Hasidic synagogue here wanted a neighboring Y.M.C.A. to block or tint the windows of an exercise room used by women. A Muslim girl was barred from playing soccer for wearing a hijab on the field. And, in Quebec, some Muslims and Orthodox Jews refused to deal with police officers and physicians of the opposite sex. Then came the decision in late January by H_rouxville, Quebec – a town of French-speaking Catholics – to create a code of conduct for immigrants that prohibited, among other things, the covering of women’s faces except for on Halloween and the use of public stoning as a form of punishment. This despite the fact that there are no Muslims in the town and no modern history of stonings.