Some tidbits from their website: (bold is mine)
http://www.wcg.org/lit/AboutUs/history.htm
But growth began to slow in the 1970s. Christ did not return in 1975, as many ministers had speculated.
As the Worldwide Church of God criticized traditional Christianity, it also attracted criticism. Many people considered Herbert Armstrong to be the leader of a heretical cult. Today, the leaders of the Worldwide Church of God reject Armstrong's doctrinal errors, but we do not hide our past. Rather, we acknowledge that our errors were deep and serious, but that Christ has rescued us from them.
In some ways, we were like Saul of Tarsus, who zealously persecuted Christians. He was confronted by Christ, transformed, and given a new mission. Although he began to preach about Jesus right away, his most significant work did not come until more than ten years later, when he became Paul, the missionary apostle.
Three doctrines were instrumental in Armstrong's conversion: 1) That God is the Creator, 2) That the Bible is true, and 3) That the Bible does not change the Sabbath to Sunday. Armstrong was guided to this third doctrine by a member of the Church of God (Seventh Day), a small group that has some similarities to the Seventh-day Adventists.
Armstrong did not see biblical proof that the Holy Spirit was a distinct person, so he taught that the Holy Spirit was an impersonal force. In this, his teaching was similar to the Jehovah's Witnesses, but there is no evidence that he obtained his doctrine from them. This anti-trinitarian view had circulated in several groups.
The Great Tribulation would soon start, he warned in the 1930s, in the 1940s, in the 1950s, in the 1960s, in the 1970s, and in the 1980s
I am just guessing, but are women still second-class citizens?
UADNA-US (Unseen Apostate Directorate of North America-United States)