Below are two very interesting articles about this issue. Note in the second one the LDS once again change the definition of a Christian belief.
religioustolerance.org/ldsvirgin.htm
*Some Mormons have taught that God the Father, and not the Holy Spirit, is the Father of Yeshua.
bullet Brigham Young (1801-1877) was a successor to Joseph Smith, the founder of the church.
He delivered a sermon in 1852 which stated, in part:
"When the Virgin Mary conceive the child Jesus, the Father had begotten him in his own likeness. He was not begotten by the Holy Ghost. And who is the Father? He is the first of the human family…
Jesus, our elder brother, was begotten in the flesh by the same character that was in the garden of Eden, and who is our Father in Heaven. Now, let all who may hear these doctrines, pause before they make light of them, or treat them with indifference, for they will prove their salvation or damnation." 1
He delivered a speech in 1860 which said, in part:
“The birth of the Savior was as natural as are the births of our children; it was the result of natural action. He partook of flesh and blood-was begotten of his Father, as we were of our fathers.” 2
bullet Prophet Joseph F. Smith (1838-1918) was the 6th President of The Church of Jesus Christ of Latter-day Saints. He wrote:
bullet “Christ is not the Son of the Holy Ghost, but of the Father.” Doctrines of Salvation, Vol. 1, Page 18-20.
bullet “…how are children begotten? I answer just as Jesus Christ was begotten of his father. We must come down to the simple fact that God Almighty was the Father of His Son Jesus Christ…God the Eternal Father is literally the father of Jesus Christ.” Box Elder Stake Conference, 1914-DEC-20, as quoted in Brigham City Box Elder News, 1915-JAN-28, Page 1 & 2.
bullet President Ezra Taft Benson, 13th President of the Church (1899-1994) stated:
“The Church of Jesus Christ of Latter-day Saints proclaims that Jesus Christ is the Son of God in the most literal sense. The body in which He performed His mission in the flesh was sired by that same Holy Being we worship as God, our Eternal Father. Jesus was not the son of Joseph, nor was He begotten by the Holy Ghost. He is the Son of the Eternal Father.” 3
bullet Elder Bruce R. McConkie, Ordained Apostle and sustained to the Twelve, (1915-1985) said:
bullet “God the Father is a perfected, glorified, holy Man, an immortal Personage. And Christ was born into the world as the literal Son of this Holy Being; he was born in the same personal, real and literal sense that any mortal son is born to a mortal father. There is nothing figurative about his paternity; he was begotten, conceived and born in the normal and natural course of events, for he is the Son of God and that designation means what it says.” Mormon Doctrine, (1979) Page 742.
bullet “Christ was begotten by an Immortal Father in the same way that mortal men are begotten by mortal fathers.” Mormon Doctrine, (1979) Page 546. 4
bullet According to author Michael Davis: “This is the standard LDS guide to church doctrine, found in nearly every active Mormon household.” 5
mrm.org/virgin-birth
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The problem with Mormonism saying that God had sex with Mary is that it comes from a worldview that says divinity isn’t so different from humanity. The whole point of the virgin conception is that it is the event where God added an entirely different nature to himself: humanity. God became a man. The ironic, pagan heresy of Mormonism’s suggestion that God had sex with Mary is that it collapses the God/man divide and reverses the larger narrative: man became a God.
Mormon apostle Bruce McConkie, in perhaps the most explicit denial of the virgin birth, wrote,
“Christ was begotten by an immortal Father in the same way that mortal men are begotten by mortal fathers.” (Mormon Doctrine, 1966, p. 547)
You might ask, “How can Mormons who believe this say that Christ was born of a virgin?” This is done by changing the definition of the word “virgin”. The virgin Mary did not have sexual relations with a mortal man, they say, but instead was impregnated by an immortal man. Bruce McConkie wrote,
“Our Lord is the only mortal person ever born to a virgin, because he is the only person who ever had an immortal Father.” (Mormon Doctrine, 2nd ed., p. 822)*