Your body is perishable (thanks to original sin), your soul (will, senses and emotions) need to be renewed through being born again, and it is done by receiving the Spirit of the Lord through Baptism and Confirmation in the FAITH, since it is that Soul that will abide eternally in Heaven with the Lord until that great day of the Lord that will resurrect the perishable and make it imperishable for eternity. In the meantime, to be absent the body (i.e. soul flies away) is to be present with the Lord (to rest in Him) for those that love Him.
I can accept a lack of faith due to a lack of grace, but really how hard can this be to understand?
I think it is pretty clear, except I see the soul as a sort of part of the body. The folds in your brain, if you will. And those folds become worm food when you die.
I suppose you could see those folds as the RAM memory and the spirit as the “hard drive” that backs it up. But if there is no spirit on which to imprint, then there is no backup. And when the body’s switch is turned off, the contents of ram are lost - for all eternity.