A) It's funny you say it's arguing from ignorance when it is the same argument your using to support your side. I'm saying it is obvious that we can experience life why do so many assume we will only experience one life? How many observable things only happen once?
You have made a claim which is absent of evidence, I'm simply rejecting your claim due to that lack of evidence, I'm stating we have one life based on the fact I'm living it now. Rejecting your claim is not arguing from ignorance, it's simply not accepting your claim why should I have to even supply evidence to disprove something that in itself can't be proved, I am not obliged to believe something based on negative circumstance. You ask
how many observable things only happen once? You have to be more specific, I could argue any specific event can only ever happen once, similar events may occur but they can not be identical for the fact two things can't exist in the same plane of space and time.
B)It is visible to us, but not to themselves.
So how does this support your claim? Your saying because we have no recollection of being consciously aware whilst inside the womb, when our brain is developing, that in turn it supports your claim that we can have an afterlife, but we have no recollection of the previous one. Your taking basic knowledge of what we observe in this world/universe and attempting to use it as evidence to support your claim of a world/universe which you have already made quite clear we have no knowledge of in the first place. It’s a logical fallacy. How can you claim what knowledge is relevant to a place you know nothing about?
C) We are all made of the same stuff what makes a person unique? What ever it is it's not the stuff that we are made of because in that we are all the same.
Visual appearance & personality make us unique, both these two factors are determined by DNA, no two humans have identical DNA this is a fact you can't get around. So although the organic matter which bodies are composed of maybe the same, it is still unique in that it can be identified to a specific individual. You still haven't got round the problem of explaining how the individual characteristics/attributes/persona of a specific being can be transferred or carry on to exist in another plane after death.
D) Justice exists, planting an apple and getting an apple tree is proof of this.
Justice only exists to moral agents such as ourselves’ the universe however does not demonstrate these same principals. Planting an apple and getting and apple tree, only proves that seeds replicate thier own RNA sequence to reproduce; this is cause and affect nothing more.