I thought this was kind of 101 stuff to be honest. That said I also know it's IMPOSSIBLE to have a clue about our spirit before we are born again, but after this was no longer something hard to grasp. Before the fall man was spiritually alive and we were connected to God our Creator.
The day man fell was the day our spirit surely died, taking our connection with God along with it. So this connection with God was severed for every man born of Adam, aka all of us save 1. Jesus our Christ was not born of Adam, He was born of His Spirit, into the world through the virgin Mary. The 2nd Adam, the Godman Jesus our Christ, born of the Spirit, born connected to God as we were created to be, sent to be the perfect sacrifice, the only ONE God could be "well pleased" with. The one with NO sin, with NO blemish, who laid down His life to glorify the Father in perfect obedience, to pay the price for sin once and for all, through Him.
Now the perfectly just and loving God can righteously forgive a filthy sinner like me by applying Jesus blood and death on the cross to me so that He can gift to me the ability to see myself in truth and to turn from it to Him. This resurrects my dead spirit, the dead spirit we are all born with, and it forever reconciles it to His Spirit, reconnecting us to Him as we were created to be. As we were before the fall. Make sense?