I am a member of the LDS faith, and based on the belief that our spirits lived with God before this life, then why is spiritual birth ("Being Born of the Spirit") during life on earth required? Based on scripture, in Rom 8:14 brought me to this question. "For as many as are led by the Spirit of God, they are the sons of God." Now if all mankind had previously spiritually existed with God prior to our existence on earth, then shouldn't everyone be the sons of God, regardless of whether they are led by the spirit of God or not? I bring this point up due to my faith being firm on the Bible, and the scripture in Romans 8:14 is leading me to doubt spiritual pre-existence with God.
My take on this is that when born into this world after the Fall of Man occurred, we automatically obtained a spiritual death, which requires spiritual rebirth. If this is true, then a prior spiritual life with God before our earthly existence could be valid. As a member of the LDS faith, I wanted some advice on how I should think of this, without having to read the Doctrine and Covenants (D&C) and/or The Pearl of Great Price, which came after the Bible. God's Word will not contradict itself, and in my belief in the LDS faith, scriptures among all the books (The Bible, The Book of Mormon, D&C, and Pearl of Great Price) should be in one accord and in line, not contradicting one another. If that is not the case, I need to reconsider my beliefs.