Amish Tripathi — Indian Author born on October 18, 1974,

Amish Tripathi , is an Indian author, known for his novels The Immortals of Meluha, The Secret of the Nagas and The Oath of the Vayuputras. The three books collectively comprise the Shiva Trilogy. His debut work The Immortals of Meluha was a bestseller, that broke into the top seller chart within a week of its launch owing to his creative marketing strategies. The Shiva Trilogy has become the fastest selling book series in the history of Indian publishing, with 2.5 million copies in print and over Rs 70 crore in sales. Forbes India has ranked him among the top 100 celebrities in India thrice in a row, in 2012, 2013 and 2014. Amish was also selected as an Eisenhower Fellow, an exclusive programme for outstanding leaders from around the world... (wikipedia)

As a writer, it's important to stay true to your story without giving a hoot about publishers, critics and readers. You should do your karma as an author the way you want to, and rest is up to God.
No disrespect to any other god, but Shiva's an outsider god. He breaks the rules. He's a brilliant musician, a brilliant dancer; he treats his wife as an equal, and she opposes him many times, but he obsessively loves her.
A bad book and good marketing won't work, the same way a good book and bad marketing will also not work. There is no choice in the matter that if you need to write a good book, you also need to have good marketing for it.
I think it's a fallacy to say that a good book sells itself. It doesn't happen. I'm a voracious reader and I can give you a long list of books which should have been best sellers but they aren't. How can you buy a book if you haven't heard of it?
I see a sense of unity in the universe. Spirituality is not limited to only one religion. One can experience it across different religions. I am fascinated by philosophy of Advaita and philosophy of unity. We have to get over the illusion that God is different from us.