This is what you said, "I possess all the Holy Books of all the religions and Sufi writings too and I accept the truth in them ..."
'All' becomes 'main'. By the way, my main scriptures, besides my Guru's writings, are the Thirumanthiram, and Thirukkural. Various sects of Hinduism have different scriptures. So too with Buddhism. The Vedas are accepted by all, and would not only be incredibly long, but also quite boring. Very few Hindus have read much of them at all. The Mahabharata is an epic story, the Gita is an excerpt from that.
The fact of the matter is you know very little about some religions, and continue to insist you do, discrediting yourself over and over. As another person has indicated, a first step towards realty on the topic would be to admit how little you know, not falsely brag how much you know. But that doesn't seem likely at this stage of the game.
Here's a list of Hindu texts.
List of Hindu texts - Wikipedia
Depending on sects, importance is given to different ones.