LDS Church Teaches:
LDS teach that every single human being that will ever live on this earth pre-existed in a spirit world prior to coming to this earth.
LDS teach all things were created spiritually before they created physically.
LDS teach that a veil of forgetfulness is placed over us, so that we can not remember our pre-mortal life with Heavenly Father. LDS.org article
The Bible Teaches:
No one has ever seen God the Father.
Only God (not man) pre-existed and came from heaven.
Physical creation precedes the spiritual.
God’s foreknowledge of all things which has not yet happened and those who are not yet born.