Because all the events people attribute to it have mundane explanations.
And I was once nearly abducted by aliens, that appeared at the foot of my bed, with ghostly white faces, and paralysed me, and started lifting me. Except I was dreaming it was happening.
I also once awoke to find I was being strangled by this rather beautiful dark haired woman. She was very strong, and was just using one hand, and pushing me back against the wall at the same time, and I was paralysed with fear. I wriggled, and managed to scream, and she stopped, and ran off. When I finished thrashing around, I got up, and made chase. The front door was locked, so she hadn't gone out of the front door. I ran to the back door. Same. Maybe she was upstairs? I got a kitchen knife, turned on all the lights, and checked every room. She wasn't there. Then, I realised, it had just been a dream.
I also once was woken due to a strange noise. I opened my curtains, to see a penny, rolling back and forth along the window sill, on it's edge. It was slow, deliberate motion. As I started to watch it, demonic voices started singing to me. I grabbed at the coin, it felt like it was stuck to the sill by a strong magnet, but eventually I tore it free. The voices stopped. I woke again, and ran to the window. There was nothing there.
Oh, and then there was the time a seven foot tall
Paper Witch floated into the room, and picked me up, and swirled me around in a dance. At each revolution, she pushed her paper fingers deeper into my arms and chest, pinning me, the grin on her face getting ever wider. Then I woke up again.
These were all frighteningly real experiences. For a short time after each event, I thought these things had happened. Shorter for the last one, of course, because that was truly crazy.
More sense than a hypnagogic dream as an explanation? No.
No Lori, it was just a bad dream. Witnessed as such by my partner, who was wide awake while I was having this experience.
Or not getting over tired, and making sure I'm well hydrated before bedtime, and avoiding hard to digest foodstuffs, ...
Your 'god' is a hallucination. Or was that Paper Witch real, too?