Yes, it is. The story was inspired by the author's claimed personal encounter and was written to share that profound event. However, some might question the authenticity or interpretation of such experiences.
Definitely. '90 Minutes in Heaven' is based on a true account and attempts to depict the events as accurately as possible. However, some artistic liberties might have been taken for cinematic purposes.
The main themes might include the afterlife. Since it's about being in heaven for 90 minutes, it will surely touch on what the afterlife might be like. Also, survival and recovery could be themes as the person who had this experience had to come back to the physical world and deal with the implications of what they saw and felt in heaven.
Yes. It is a very remarkable account. It tells a story that seems almost unbelievable but is presented as a true near - death experience, which makes it quite unique.