Anthony,
You say that there are 1.8 billion Christians to spread the word. If you really believe what you say, why is it any concern what JWs believe or the Mormans or anyone else?
Thank you for telling us your religious affiliation. Obviously, this is not a religion that is familiar to us in the US. However, you message is very similiar to the Baptists and the Pentacostals in this country. The scriptures they quote and the personal testimony they give are identical to yours. These people DO NOT believe that there are 1.8 billion Christians. To the contrary, they believe that it is their job to bring these so-called Christians to the true religion, which of course, is their's.
Now, back to my first statement. If all are Christian, what does it matter what they believe, if they "love the Lord?" I would certainly take a blood transfusion, and I would authorize it for a loved one. Howvever, everyone has beliefs they are willing to die for, and if someone wants to die for something for their beliefs that's their perogative.
We here have heard the "one way" message before, in fact, most of us have espoused it. Yours is a different message, but has the same "one way" ideation. I think that if you really believe that we are all Christian, as you say, then I think you should concentrate your message on nonbelievers or non-Christians.