Holy book Shrimad Bhagavad Gita was granted for the welfare of mankind.
In this book "Gita Tera Gyan Amrit" you will come to know which are the certified scriptures according to which one should do worship. This book talks about the scripture-based way of worship and the method of doing that worship. It also clarifies concepts like "Identity of a Complete Guru" and which Guru can impart the true method of worship.
Holy book Gita was granted for the welfare of mankind at the time when there was no religion. There was only "Mankind" religion. Holy book Gita does not belong to any religion. This book will unite the people of the world.