In the end, orthopraxy is crucial to the understanding of Hinduism not because Hinduism entails no particular beliefs or because it makes no claims for orthodoxy; different traditions do espouse particular beliefs, and many will not hesitate to claim orthodoxy for those beliefs. Rather, orthopraxy is important for Hinduism because the commonality of practices among Hindus far exceeds the commonality of beliefs. Indeed, it is not merely religious scholars but also Hindus themselves who define Hindu identity in terms of practices more than beliefs. This emphasis on practice rather than belief runs counter to the typical Western model of religions, but it is an emphasis that proves characteristic not only of Hinduism but also of Asian religious and social traditions generally.
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Islam generally stresses orthopraxy over orthodoxy. This can be seen in the fact that the account to be rendered on the day of judgement (yaum al-Din) is one of works.
However, since the practice is held to come from doctrine, this is essentially orthodoxy applied to practice.[
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My books on Islam, beyond getting me to dislike the religion (they're written by an observant Muslim), also describe Islam as an Orthopraxic religion.
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The point regarding China vs India is that China is an intensely secular society; the society does not require religion as a way to worship itself (Durkheim's definition), it just goes straight to worshipping itself. There are, of course, religious outcroppings, but ethics are determined by tradition and custom, not because of what is said in a holy book as in some other cultures.
I don't think China is that much of a problem for Pakistanis; I'm told Muslims like atheists better than idolaters, with the joke being that the only difference in faith is that Muslims append "but Allah" to "there is no God", so atheists are closer to Muslims than worshippers of non-Abrahamic religions.
The fact that India is religious, while China is secular, means that culturally speaking, despite sharing Buddhism and a racial group with the Chinese, the Tibetans are more likely to lean toward Indian culture than Chinese culture.