Premortality and reincarnation are two different concepts. Yahweh said to Jeremiah: " Before I formed thee in the belly I knew thee; and before thou camest forth out of the womb I sanctified thee, and I ordained thee a prophet unto the nations."
"Ah, Lord God !" replied the prophet, "behold, I cannot speak: for I am a child.
But the Lord said unto him, "Say not, I am a child: for thou shalt go to all that I shall send thee, and whatsoever I command thee thou shalt speak." In other words, the Lord can take the weak things of the earth and make them strong, as He tried to do with Moses.
It would have been a great time to tell him he was an accumulation of a number of reincarnated personalities, but Jeremiah knew he existed before coming to the earth. And later, when Jesus' disciples saw Him heal a blind man, one said, "Master, who did sin, this man or his parents, that he was born blind?"
The more we learn from recently discovered Christian writings, the more obvious it is that the early Christians did not believe in the soul sleeping doctrine of the Adventists.
Although Mormonism is the only Christian faith to officially teach premortality as a doctrine, other churches are beginning to take another look at it because of 1) the greater understanding we have of first century Christianity, and 2) the proliferation of near death experiences on the parts of people of all religions. It's not unusual for Mormons to report experiences that include a belief in premortality, but it's another thing for Evangelicals and other Christians to support the doctrine through their experiences. Yet many are the accounts of people passing through the veil and seeing people they knew "before" coming to Earth. Besides, with human lifespans being what they are, mortality rates, physical restrictions and the difference in cultures, reincarnation would serve almost no purpose.
Finally, on a Jewish forum, one participant states:
The Midrash Kee Tov states that before the creation of the present world there were 1,972 generations. During this time all the souls of the righteous were present including Adam, Noah, Abraham, Moses, etc. It ends with the following statement: "They [souls] were with God before the creation of the world."
I can think of few things more discouraging as the doctrine of reincarnation. My wife and I recently had dinner with friends, one of whom expressed a belief in reincarnation. When I told her I'd rather go down to an eternal grave than live through multiple iterations, she was aghast! "Oh, no," she said. "Things keep getting better! You don't go from better to worse!" But how would she know? All I know is that once I die, I ain't comin' back, no way, no how!