I'm not privy to all of their internal publications because my "Bible study" "teacher" says I'm "not ready" to read them ... I directly asked if I could have or borrow them & even offered a donation for them, but my "teacher" staunchly refused.
That is a huge red flag. You're not allowed to know what they really teach until you've committed to the organization and passed their scrutiny. The core teachings are secrets for the worthy members. Why do they hide their "truth" from the public at large? Are they ashamed of it?
If you want to learn what mainstream religions teach and believe, you can learn before joining up. They make sure their message is widely available at bookstores, the public library, radio, television, the internet, etc. If the teachings are true, why hide your light instead of shining it for all to see?