Vanderhoven7
"Can a person be a Christian if he or she doesn't believe that the events purported by Watchtower to have taken place on these three dates actually happened?
In other words does one have to believe in 1914, 1918, and 1919 to be a Christian?"
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The answer is NO. Such parabolc interpretations and others are not considered to be primary doctrine - not essential for sakvation.
However, such interpretations are helpful and beneficial for one's faith, especially in establishing the identity of the true and only eschatological Church which alone is doing the Lord's work today by preaching the Gospel.
scholar JW