But is God not changeable? My philosophy is that many pagan religions were actually their interpretations of God as he appeared to them. If God appeared to ancient cultures differently based on how he wanted them to interpret him, wouldn't it stand to reason that God appears to us all uniquely based upon the interpretation we personally discover? Besides, I always interpreted the "Church" as not a reference to sects and divisions and establishments, but rather God's Kingdom. Jesus brings the final incarnation and update from God and thus establishes his "Church." As all of us are members of the body of Christ, we all are members of the church. And as a body has many parts and functions, so do our own interpretations of Scripture and how our personal faith impacts the Church.
As I understand it, God didn't make an appearance to any Pagan past or present.
God is the earth beneath the feet of Pagans. The moon in the sky, and the stars above.
Our bodies don't "have" souls, souls have human bodies.
As to free will in the afterlife - the soul inherently clings to its body after the body's death.
Yes, there are memories initially. And that is natural. The soul or spirit or, quite simply, the "energy" is used to being connected to the body. And that is why it lingers.
But eventually this "soul energy" dissipates and ultimately scatters becoming a part of the earth, the moon, and the stars above.
At that point, no, there are no more memories. Sorry to break it to you. But that is the nature of things.