I hope you are not marshaling an argument for the pre-existence of human souls....that before the foundation of the world God created a warehouse full of souls and them plots them into a person at conception? Multiple problems here. Multiple.
That's Platonism and clearly is gnostic (soul/good.... body/bad). Contrast this to Genesis....God's creation was good.
The pre-existent of course comes from Plato's theory of ideals. It Plato’s dialogue between Socrates and Pheado, he says,
The Fifth Ecumenical council also known as the Second Council of Constantinople condemned the teaching and Anathematized it as heresy.
Pre-existence solves nothing about the problem of evil because even if we were souls with properties and personalities, God would know each of those personalities "before" creating them (even without time, souls are still ontologically reliant on God for their existence and properties), so he would know who would rebel. I don't know why a loving God wouldn't simply just not create that soul. If God did create that soul this would de facto make God the author of evil and liable for sins continuance.
Creationist have a bear of a time with the problem of evil. You will notice when studying this issue....the problem of evil is clearly ignored. They run away from it always.
My advice to my fellow CF'ers....push the problem of evil. Make them solve two issues at the same time. Is God the author of evil and responsible for its continuance?
Jesus had a pre-existent divine nature, but a created body and soul......this is the only example we have in Scripture.