Have you ever had a near death experience? they are super scary
I've never had one but I read about them. They typically involve some type of detachment from the body. 
Yeah, that seems so crazy to me, I would not enjoy that, I would rather just die
It seems like it is totally normal and neurologists think it is bodily multi-sensory integration. 
that sounds complex, I know many people equate it with a religious exprience
Yes, some people do equate it with a transcendental or religious experience. 
I have heard my family tell similar stories in the past
A French psychologist came up with the term and the definition.