With regard to the Fall. I think a better way to think about the story is this. Adam and Eve were very close to God, the source of all being and life. Like all of creation, they were perfect - in fact they were the pinnical of creation, and were intended to act as a kind of link between God and lower creation like the animals.
But they had free will, and chose to sin - that is, move away from God who is truth, and towards nothingness. Having done this, they immediatly felt the consequences. They were cut off from full relationship with God, and from being and life. They became subject to death. But they also could no longer see and hear God properly, because of the distance, and so they made errors and bad choices. There body no longer worked properly, or their will, or heart, and they could not always control their actions. They were afraid of death, and so did crazy things. They also were no longer able to properly stand between God and the rest of creation, and so creation fell as well, and we see suffering in the animal world, earthquakes, etc. These things further contributed to mankind’s problems.
And the same happened to their children, because the children were also living in a fallen world, with fallen parents, with the threat of death hanging over them.
All humans, although having individual souls, share in our common human nature. After this fall, our nature was changed, or deformed, or no longer quite right, because it was affected by being separated from its source, God. So it affected the children as well. (This inheritance is what some call original sin. Although some say that the children are guilty of the sin, that isn’t always how it is described. It can be thought of more as feeling the effects of the sin. Just like a baby whose mother drinks a lot of alcohol - the baby bears no guilt, but may feel the physical effects of alcohol poisoning in the womb, or the effects of being raise by an alcoholic mother.)
So what does Christ have to do with this. In the Incarnation, God unites human nature to his own nature. In a way this tells us something that has been true since the beginning - the nature of creation comes from God, and is so close to it that it actually subsists in a way within God. When God becomes a man, he is reuniting the human nature which we have abused with his own nature, and making it again perfect. Only he can do that - we have no power of our own to reach to God - he must reach to us, just as we could not create ourselves.
Christ goes through all the things a human does. He is a baby, he is a boy, he is even able to contemplate doing something that he should not. And he dies, and goes to the dead. But he is no mere creature who can remain a immortal souls eternally separated from God. He is God, and in his death he has brought God even to that cold place - God is indeed everywhere. Death is destroyed, and we can again choose God if we wish to, despite our limitations. God will always come to us if we want him, even to the darkest places.
Anyway, perhaps this may be a more fruitful way of thinking about the Incarnation for you.