The Worldwide Church of God (WCG) is a Christian denomination founded in 1934 by Herbert W. Armstrong. Initially, it emphasized a unique interpretation of the Bible, focusing on the observance of the Sabbath and the celebration of biblical festivals. The church gained a significant following, particularly in the United States, during the mid-20th century. In the 1990s, after Armstrong's death, the WCG underwent major theological changes, moving towards mainstream Christianity. This shift included abandoning some of its distinctive doctrines and embracing traditional Christian beliefs, which led to a decline in membership but aimed to foster a more inclusive community.