The Judaism of the Pharisees, Sadducees and scribes who rejected Jesus and continued to look for an earthly salvation and kingdom continues today although it is smaller comparatively (10th largest religion). They essentially believe that people will be judged for heaven based on their works although a “perfect” faith is necessary. Similar in many ways to Modern Roman Catholicism. Modern Roman Catholicism begins sometime around 800 AD and is complicated because most of the doctrines that protestants would consider heretical and contrary to biblical Christianity do not arise until the late Middle Ages (worship and trust in Mary, salvation by works, purgatory, the Pope as infallible). There has always been great diversity from the beginning (the eastern church) and true Christ-centered and Biblical religion has always existed although sometimes was in the minority. Mormonism was founded by Joseph Smith in the 1820s in Palmyra New York, although its adherents moved to Kirtland, Ohio and Jackson County, Missouri, and then to Nauvoo, Illinois, before beginning a migration in several waves westward under Brigham Young after Joseph Smith’s death in 1844. The contemporary Fundamentalist and Polygamist sects of Mormonism came out of the decision to divest Polygamy in the 1890s and Liberal Reformist Mormonism came out of the secession crises (following Emma Smith and others) after Joseph's death in 1844 and other modern day phenomenon in the 20th century (into many different groups). All these distortions have one thing in common in their present form (and that is an important note) they are distortions of True and Biblical Christianity and their promoters will be without excuse and held accountable for leading astray the souls of men in the day of judgement. They have completely covered over the gospel of Christ with the rules of men so that they are no longer worshipping the one true God in the only manner He has prescribed: through salvation in His son alone.
Listen to Stephen’s Speech against false religiosity on this matter to the Jews: