If you believe in angels then you are not sure about it. It is just like saying i believe that the fire will burn if you touch.
I didn't say that I am not sure about angels, I said I believe in angels. And I said I am not sure about whether near-death experience is true or not. Hope I am clear here.

Yea. Death is a very secret phenomenom. I could recall some of the words from saints.
But before that we have to accept the presence of soul. The soul takes limitless birth. Once we are bound with this body, then the consciousness also trapped. It can only gain information through the physical body. And when we come out, we are no longer physical and it is suble. We can know all our karma and it is a broad consciousness.
As I believe in Guardian angels I accept the presence of souls as well.