Those called Hindu fundamentalists are also divided up into these different sects. Hinduism contains too much plurality to allow for that. Its tendency is to not to coalesce into a fanatic unity like the fundamentalists of other religions, but to disperse into its various diverse components and fail to arrive at any common action, historically even one of self-defense against foreign invaders. Fundamentalist groups insist upon belief in the literal truth of one book as the Word of God, which they base their behavior on. Muslim fundamentalists insist that the Koran is the Word of God and that all necessary knowledge is contained in it.
Christian fundamentalists say the same thing of the Bible.
Again even orthodox or ordinary Muslims and Christians, not only fundamentalists, may believe this to some degree. Hindus have many holy books like the Vedas, Agamas, Gita, Ramayana and so on, which contain a great variety of teachings and many different points of view and no one of these books is required reading for all Hindus. Hindus generally respect the holy books of other religions as well. Christian and Islamic fundamentalists flout their holy book and are ever quoting from it to justify their actions and their beliefs. Fundamentalist groups are often involved in conversion activity wherein they are seeking to get other people to adopt their beliefs.