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What is begotten?
Mormons believe that all people are eternal. They teach that in some form they have always been around, being born into heaven was a similar event to being born on earth. They believe that we existed in a spirit world before coming to earth, heaven if you will. They believe that they were born to God in a way similar to being born to their earthly fathers.
I don’t know anybody who has been there, heaven so it is kinda of hard to argue the point.
I’m not here to debate theology, just pointing out what Trinitarian Christians believe. As you have so aptly pointed out Mormons do not beleive the same as Trinitarian Christians.
Below I will provide some sources on Trinitarian belief. Please know that I am not a Romney supporter nor am I a Huckabee supporter. I support Hunter and Thompson. I do not support Romeny, Huckabee nor Giuliani and that position has nothing to do with the religion of any one of them. I believe them to be Rinos and I will only support conservative candidates.
http://www.basictheology.com/articles/Trinity_Development/full/
Also from Wikipedia...
Trinitarians
Most Christians believe that God is spirit (John 4:24), an uncreated, omnipotent, and eternal being, the creator and sustainer of all things, who works the redemption of the world through his Son, Jesus Christ. With this background, belief in the divinity of Christ and the Holy Spirit is expressed as the doctrine of the Holy Trinity,[31] which describes the single Divine substance existing as three distinct and inseparable persons: the Father, the Son (Jesus Christ the eternal Word), and the Holy Spirit (1 John 5:7). According to this doctrine, God is not divided in the sense that each person has a third of the whole; rather, each person is considered to be fully God (see Perichoresis). The distinction lies in their relations, the Father being unbegotten, the Son begotten of the Father, and the Holy Spirit proceeding.[32] “Begotten,” in these formulae, refers to the idea that Jesus was uncreated and “eternally begotten” of the Father.
Christians of Reformed theology also conceive salvation to be one work of the triune God in which “the three divine persons act together as one, and manifest their own proper characteristics” with the agency of the Holy Spirit as an essential element.”[33]
Trinitarian Christians trace the orthodox formula of the Trinity — The Father, and of the Son, and of the Holy Ghost — back to the resurrected Jesus himself who spoke these words, and which words were subsequently recorded in Matthew 28:16-20, and are commonly referred to as the Great Commission.
The “Indwelling of the Holy Spirit” has been called the “common privilege of all believers.”[34] John 20:22 quotes Jesus as saying to His apostles, “Receive the Holy Spirit.” They were to receive the Holy Spirit Himself in some way. Nearly all Christians speak of the “Indwelling of the Holy Spirit.” The person who has “received the Holy Spirit” thereafter not only has a sinful nature and carnal desires. According to this theological position, there now is also a second, competing, moral presence, that of the Holy Spirit, forever indwelling within him/her. From that point on, the person is able to see daily situations from either of two perspectives, and as a result, can choose to respond in a moral, Christian manner. However, the Christian often ignores these ethical, moral, positive thoughts inspired by the presence (indwelling) of the Holy Spirit, and respond in some selfish or lustful way as their own original nature desires.[35] (John 16:7-14; 1 Corinthians 2:10ff)
In Catholic, Orthodox, and some Anglican theology, this indwelling is received through the sacrament called Confirmation or, in the East, Chrismation. In most Protestant traditions, the “Indwelling of the Holy Spirit” takes place in the action of becoming a Christian.[35]
The New Testament also teaches that the Holy Spirit inspired all Scripture,[36] a belief shared by most Christians.[37]