Hi inbetween
Did you notice you own introduction of "God's channel" strawman into the argument you set down?
You were playing out a scenario of witnesses teaching something other than what is written in the Bible in your example but you do not actually bring any specific example into the equation? Basically an empty accusation with no prove other than your opinion.
At this point people usually bring in a strawman like, bible prophecy fulfilment (which you check again the world as to it's fulfillment not the bible) or "God's channel" or "accusations of being a cult" or some hearsay example of some person among other common place examples I see on here. None of which are teachings you actually check against the Bible basically as my original point says... These are just strawmen arguments people have learned from various sites.