 During the early 20th century, the society's theology moved in a more liberal direction under the leadership of Eugene Stock.There was considerable debate over the possible introduction of a doctrinal test for missionaries, which advocates claimed would restore the society's original evangelical theology.In 1922, the society split, with the liberal evangelicals remaining in control of CMS headquarters, whilst conservative evangelicals established the Bible Churchmen's Missionary Society (BCMS, now Crosslinks).