A Question for Honest Mormons

LDS President Gordon B. Hinckley made an official speech in Europe in 1998, reported in "LDS Church News." That publication bills itself as "An official publication of The Church of Jesus Christ of Latter-day Saints." This quote of President Hinckley's words is taken from that publication:

"In bearing testimony of Jesus Christ, President Hinckley spoke of those outside the Church who say Latter-day Saints 'do not believe in the traditional Christ. No, I don't. The traditional Christ of whom they speak is not the Christ of whom I speak. For the Christ of whom I speak has been revealed in this the Dispensation of the Fulness of Times. He, together with His Father, appeared to the boy Joseph Smith in the year 1820, and when Joseph left the grove that day, he knew more of the nature of God than all the learned ministers of the gospel of the ages.'..."

http://www.ldschurchnews.com/articles/31188/Crown-of-gospel-is-upon-our-heads.html

Christians celebrate the two great events of Christ's life: His birth, at Christmas; and His resurrection at Easter.

Mormons also celebrate Christ's birth and ressurrection. "The Book of Mormon" refers to those events, though neither event occurs in "The Book of Mormon," in its American setting.

Both those events occurred in the Middle East, in the life of the "traditional" Christ. "The Book of Mormon" does not claim otherwise.

So why do Mormons celebrate events in the life of the Christ President Hinckley taught is not Mormons' "Christ" ?

Isn't that deceitful, to themselves and to others ?