When Jesus stepped into the waters of the Jordan and was baptized by John the Baptist, he did so not because he was in need of repentance, or conversion: he did it to be among people who need forgiveness, among us sinners, and to take upon himself the burden of our sins.
I understand what happens to the brain when people are near death, and I had always believed there were good scientific explanations for the heavenly out-of-body journeys described by those who narrowly escaped death.