agnostic literally means "without knowledge", it has nothing to do with proof.
are you a unicorn agnostic? is this how you describe yourself in general society? a leprechaun agnostic? I am not being facetious.
The concept of god is non falsifiable. If you are an agnostic on god you pretty much have to be an agnostic on everything in the universe that may have even the slimiest possibility of existing. That's ridiculous. At some point, there is enough evidence, enough better explanations for our world and existence, that the concept of god is entirely redundant and not useful. The only reason you are "agnostic" is because of living in a world where you have been indoctrinated to give a higher level of accordance to a particular set of fanciful beliefs. You think you are being reasonable and middle road, but really you are entirely brainwashed.
"The Big Book of Near Death Experiences". Tells about people 'dying', their experience, and their thoughts on being brought back to life. I thought it was interesting. Thought it was some brain reaction to the dying process, even though there were numerous examples of people 'seeing' things it was impossible for them to have seen.
Anyway, I'm not a Christian, you probably are and think others have been 'brainwashed' like you had been. That's not my upbringing baggage. I've been a skeptic ever since Kindergarten. When I say 'Agnostic' I'm not referring to some guy with a beard and wild hair looking like Zeus, I'm referring to 'The Unknown'.
Does the 'Soul', 'Spirit' survive, or does it vanish, like the physical body? I can't answer that question.
Short Story.
My wife died 5 years ago (heart attack). She was in this room going through some procedure when she died, I rushed in about 15 minutes after she died. I talked to her, said all the things I should have said but never did. I noticed in the right hand corner of the room her face and upper torso, smiling a radiant smile as though she was the happiest person in the world. Now, this was like this book had talked about "right hand side, in upper corner", so I thought I was just subconsciously thinking this. When I finally had enough courage to look directly at her, she wasn't there. I asked her "Stay with me Baby, never leave me". She said "I'll come back and visit". This wasn't really what I thought she would say if I was just subconsciously 'thinking' this. I figure she would say "I'll be with you forever" or some bullshit like that. Saying she would "Come back and visit" really made more sense. So, in my peripheral vision, she was there, a golden radiant smiling entity, smiling pure happiness, for about 15 minutes. I stayed with her for about an hour, until around midnight. I never saw her 'radiance' again.
So, bottom line ... the Spirit or Soul ... may continue to exist in my mind. Her body doesn't. It was cremated and rests in her Flower Garden in front on my house, I walk past it every day.
At night, I look into the Stars and hope she is there, with her ancestors.
"agnostic literally means "without knowledge", it has nothing to do with proof."
That's why I usually refer to myself as 'Agnostic'. I acknowledge I have no proof as to what happens after dearth.