My understanding is that we originated in terms of divine creation as spirit-Beings, living in a situation of "obedient love" with respect to God.
In that sense we began as "angels" - perfectly-Good servants and messengers of God, but without agency (i.e. "free will").
This was our spiritual childhood, because we loved by means of obedience. We found our-selves living "in" God's love, but un-consciously; therefore passively and spontaneously we accepted love as the basis for life (and creation).
As consciousness developed (some Beings developed faster than others, and probably some did not develop to this point) we became agents capable of choice. Capable of choosing to accept or reject our then-current state.
We became capable of choosing to reject the state of living "in" love.
Then some pre-mortal spirits (i.e. the demons - and perhaps the Devil first of all) chose to reject and oppose God and divine creation. The rejecters remain as pre-mortal spirits, but have chosen disobedience to God and opposition to divine creation.
Thus evil entered creation.
Others chose the next step in development; which is to incarnate as a mortal Beings - after which temporary phase there is the opportunity actively to choose to live eternally "in" love; as resurrected incarnate Beings in the state of Heaven.
Thus; we begin as spirits unconsciously living in a child-like state of obedient love; then (due to Jesus Christ's work) those of us who chose the temporary path of mortal incarnation will have the opportunity consciously to opt-into living eternally in a mature-adult state of chosen love.
The pre-mortal state is one of living wholly in-love, but it is not Heaven; nor is it conscious, nor active.
Heaven is a wholly-Good state inhabited by those who have-been mortal incarnates, and who then have consciously chosen to live eternally in-love.
The point of this post is to emphasize that we have not known Heaven. Heaven lies in our future (if we make that choice) but not in our past.