You wrote:
“You might want to start with this.”
The United Church of God? That’s a sect started by the cult leader Armstrong. And you want me to believe they got their facts straight when they couldn’t even realize they were in a cult for more than 40 years?
United Church of God was started 10 years after Herbert Armstrong died. It's a completely different entity legally and doctrinally.
From a brief history of United Church of God:
Many of the current ministers and members of the United Church of God were once members of the Worldwide Church of God, a nonprofit corporation under the leadership of Herbert W. Armstrong until his death in 1986. A subsequent unwarranted shift toward nonbiblical practices and beliefs led numerous ministers and members to leave the fellowship of that organization.
Concerned with uneven administrative practices of the former assembly, more than 100 ordained ministers developed a new administrative structure that was more directly accountable to members and the ministry. A new 12-person Council of Elders, elected by a general assembly of all ordained ministers in United, was tasked with reviewing and independently documenting all core beliefs and doctrines of the Church, which above all must be true to the biblical record and not reliant on later divisive philosophical and theological traditions that were developed centuries after the original apostles. That task has been largely completed, and the Church's formal Statement of Fundamental Beliefs is published for all to see on its Web site: www.ucg.org/about/fundamentalbeliefs.htm.
Comparing United Church of God to Worldwide Church of God under Armstrong is in many ways like comparing Protestants to Catholics.