Original sentence: Groulx held that those of other religions were, by not being Catholic, opposed to his religion.Groulx's anti-semitism has made him a controversial figure.Groulx's supporters have declared that his his anti-semitism has to be understood in the context of his conservative Catholic beliefs.Groulx's was opposed to immigration to Canada of Jews, Mennonites, Mormons, and other non-Roman Catholics.Those who have championed his ideas, principally members of Quebec's national movement, that seeks separation from Canada, have sought to minimize his life-long, openly expressed, anti-semitism
Edited sentence: But Groulx's very conservative Catholicism has also made him a partly controversial figure; not only is this Catholicism decidedly out of fashion but conservative opinion before the Second World War was easily anti-Judaic (see MacKenzie King, Duke of Windsor, etc.In Groulx's case, although he declared racism reprehensible, defiance of other religions made him occasionally express the idea that immigration to Canada should be Christian, and specifically was suspicious of other religions such as Jews, Mennonites, Mormons, etc.This has at present focused the attention of many writers, not always ready to judge his writings in the context of his times