Folk religion:Beliefs, customs, and rituals that are held, practiced, and transmitted by the people or "Folk" outside organized religion.
Folk religion cannnot always be separated easily from Buddhism from it has assimilated and preserved many practices of these established religions.
In front of god image, flowers and food are always offered still now.
Dots on this map mean location of stone pillars and god images.
I refered to the 'Keys to the Japanese Heart and Soul' by Kodansha.