United Church of God
UCG believes that some Christian beliefs have been wrongly changed long ago in the early church. It believes they were changed by people who tried to mix their own ideas with Christian beliefs. It believes they did this because they hated Jews, or were pagan, or Gnostics, or Greek philosophers. These wrong ideas became traditions in the Catholic church and Protestant churches, which they believe go against the teachings of the Bible. So, for example, they don't worship holidays that started out as pagan, like Halloween, Christmas, Valentine's Day, and New Year's Day.