I have researched this extensively because the question you ask can more generally be phrased as "Why am I here. What is my purpose?" When I study the bible I use the King James Version which was first translation to English and I verify every word of every verse by crossreferencing to the Lexicon and Strong's Exhaustive Concordance which allows you to read the verse in Hebrew. And in Hebrew every word had multiple meanings just like English for example pool, leaves, rose. When you research this way you can sometimes identify things that are otherwise unclear. A good example is the story of creation and Adam and eve. I will not detail that story as if you use this method it is the easiest to see the truth which is taught pretty much nowhere. Suffice to say they were not cast out for eating an apple or any other fruit, nor were they the first 2 humans.
I am digressing my original point I wanted to make and forgive me because I am away from my computer and do not have all my reference materials to give you the exact scriptures, but here is my interpretation as to why we are here and why there will be a second coming.
When Satan took the thrown and proclaimed himself to be God there was a war between God, the archangels, Satan and the demons. The demons were angels as well. We were all there, we were all angels, we were all in spiritual form. Those that sided with God were the archangels. Those that sided with Satan were the demons. Those that chose not a side were us. After the war, God had a conundrum because he loved us, and while we had not turned against him we failed to fight for him. He recognized the dangers of Satan's influence, Satan's power, and Satan's ability to corrupt and decided he had to irradicate evil. He could not risk any of the neutral becoming evil after eradication and decided he needed a way for us to choose. So he made a perfect physical creation on which he could place the veil over our spirit and force us to choose through free will. Every soul on earth is here to make a choice. Good, or evil. When we die, the veil is lifted and we once again will recall everything that was, has been, and ever will be. When the final soul is present on earth, and the final choices have been made christ will return and we will be given a final chance to choose if we have not made our final choice on earth before we returned to spirit. We will enter the reign of Christ at that point. We will spend 2000years with Christ being taught the truth and witnessing God's grace in spiritual form. Many that chose correctly during their time on earth will be teachers. Those that chose incorrectly and never repented will be separated and taught in more strict environment in an effort to redeem them. Those that chose to follow Satan and evil while here will be locked in the pit awaiting the end of the reign. When the reign is finished the day of judgement will finally come. We will stand before the almighty and christ will testify for us or against us based on the choices we have made. God's judgement will be final. He will decide either A we will never revert back to evil and will only do good from that day forward, or we are irredeemable at which time our name will be stricken from the book of life. If your name is stricken you do not burn in he'll for all eternity you disappear. You never existed. It is kind of like time travel. Your family your friends won't miss you because at that point you never were, never have been, and never will be. You are gone, erased from history, erased from existence. We have physical mother's and fathers, we do not have spiritual mother's and fathers. God is the father of all of us. All he wants is for us to love him and be good. We have physical mother's and fathers because he wants us to experience that love to help us see why good shall always conquer evil. When the day of judgement concludes peace and glory will reign for eternity.