According to anthropological study, Native Nepali and Indigenous people of Nepal did not create “Pitri Puja” yesterday. Pitri Puja is their native and the oldest Religion. Pitri Puja is the oldest religion in the whole world. Pitri Puja is older than these Buddhist, Christian, Muslim, Judaism, Khanphusim and Jain religion. If you study and research about Pitri Puja, you will find that it is the only true, purified and real religion. What is Pitri Puja? Pitri means “Ancestor” and Puja means “Pray” in Nepali word. Historical record tells Pitri Puja origin back in Stone Age. In Pitri puja, native and indigenous people pray for their ancestors… it is a time that they can remember and respect to their ancestors. But there is native way of cultural ritual to process Priti Puja. Conclusion: Whatever you read in your book is wrong. Read real anthropological books.