If a JW had the nerve to ask me this question, I'd say to them, "You go first. Using only scriptural proof, show me why you believe that the WTBTS/CCoJW is God's choice and I'll tell you if I agree with your scriptural reasoning."
Wait for the silence and the rabbit in the headlights moment.
I searched on the WT CD ROM for references of "channel of communication."
There are numerous pathetic explanations by the cult, but I'll limit them to these 3 examples:
w81
12/1 p. 27 par. 4 - "Unless
we are in touch with this channel of communication that God is using,
we will not progress along the road to life, no matter how much Bible
reading we do." (you're gonna die without the WTBTS)
w75
7/1 p. 413 par. 26 - "As we absorb more and more of Jehovah’s
thoughts and ways, we will have a deeper insight into the One to
serve and obey, and we will appreciate to the full the fine
relationship possible with him and his Son, our channel of
communication." (Shouldn't we serve & obey the WTBTS as our channel of communication?)
w91 9/1 pp. 18-19 par. 15 - "That faithful and discreet slave is represented today by the Governing Body of Jehovah’s Witnesses, which has as its publicity agent the Watch Tower Bible and Tract Society."
(That makes sense: the WTBTS is the Wizards of Warwick's spin-doctor!)