Actually we do teach that and have for YEARS........ ]
What about:
*** w71 1/15 p. 63 Questions From Readers ***
Questions From Readers
Can it be stated flatly that only baptized witnesses of Jehovah will survive Armageddon?—A. S., U.S.A.
It would be misleading to answer this question with either a simple “Yes” or a “No.” The Scriptural answer of necessity must be a “qualified” one, and it is easy to see why.
Don't all Christian professing denominations claim to be following the Bible?
Yes but merely claiming to and actually teaching are two different things. Most christain religions teach the trinity, hellfire, immortality of the soul, salvation being more important than God's soverignty, etc. The implication is yes, you need to be one of Jehovah's witnesses, but that isn't what is preached door to door at first. What is preached is one needs to learn what the bible really teaches and then the decision to do something about that is up to them. That same article I quoted about says:
There appears to be no Biblical reason for thinking that a person who had a reasonable knowledge of Bible truth and knew the importance of dedicating his life to God and being baptized, but who held back from doing so, would be preserved by God through the coming destruction.
We are aware that many hypothetical or “What if . . . ” cases can be raised, cases that seem to involve extenuating circumstances. What point, though, is there in speculating on these? Jesus’ illustration of the “sheep” and “goats” makes it plain that a time will come when the division between the “sheep” and the “goats” will be clear and final. (Matt. 25:31-46) Instead of looking for “loopholes” in God’s arrangement for salvation, what all humans who desire preservation need to do is take full advantage of God’s merciful opportunity to serve him. And they need to do so now, before it becomes too late to begin thinking about becoming a servant of Jehovah. The “sheep” who are preserved into “everlasting life” will be responsible persons who do God’s will as completely as possible. (1 John 2:17) The Bible shows without doubt that Jehovah’s will for humans today includes being baptized and being public witnesses of him.—Rom. 10:10.