The Bible is first on this list. Other titles among the most popular based on printing volume include The Koran, Mao's Little Red Book, and the Communist Manifesto.
The Bible and other religious books like the Koran would be the most read. The country you live in dictates what can be popular and allowed reading for other popular books. Mystery is very popular in some countries and not allowed in others such as romantic reading. In the US we take for granted we can read anything we choose.
The name of the most popular book is "The God of Small Things". It was represented as a owner of Booker prize. It has so many feature of a man. This book is written in simple word.
The top books, in sales, are "The Bible", "Quotations from Chairman Mao", and "The Koran". "A Tale of Two Cities", and "The Lord of the Rings" run close behind.