The cable said in the democratic, multi-religious, and multi-ethnic society that India is, secularism is synonymous to tolerance of all faiths and extremists are far outnumbered by 'secular' moderates.
"India's large Muslim population, and that community's relatively positive relations with its Hindu majority, also offer insights on how we can more effectively engage in the battle of ideas against violent extremism within a democratic, pluralistic society," said the cable coming of the US Embassy in New Delhi in April 2006.
The United States accuses WikiLeaks of stealing its secret cables, though it has refused to either deny or confirm their authenticity.
"We can learn a great deal from India's management of its large society to minimise extremist ideologies. India enjoys a democratic, multi-religious, multi-cultural, heterogeneous, multi-ethnic society where all major world religions are practised freely," it said.
"Isolated elements of religious extremism of many varieties have, however, occurred in India -- notably among Hindus, Muslims, and Sikhs -- although extremists as a whole are by far outnumbered by 'secular' moderates," the US Embassy said, praising the secular democratic tradition of India.
It said in the Indian context, secularism stands for tolerance for all faiths, and does not imply life devoid of religion, although religious freedom -- including atheism -- is protected and guaranteed by the Constitution and a long history of court precedent.
"At a time when many nations appear to be losing ground to extremist movements, India's trendlines are pointing in the right direction, bolstered by strong indigenous traditions of communal co-habitation, non-violent political protest, a free press," the embassy cable said.
It also noted a realisation by politicians that religious hatred is not a vote getter among the "increasingly savvy, globalised, and prosperous Indian electorate".
However, it said a risk of isolated outbreaks of sectarian violence remains. "... especially in response to the terrorism that has plagued India for decades, or when provoked by regional politicians for their narrow political purposes (for example, the recently passed anti-conversion legislation in Rajasthan)," the cable said.