Leave security agencies to tackle the hard core criminals direcly. Support them with information and praise, when ever they need. Regarding ideological issues with Islam, Christans in West are better equipped than Hindus. Only Christans can match with Islam in terms of resources and network. Hindus are far behind the two. They should not waste their limited resources to start an 'ideological debate' with Islam in India. Moreover, Indian muslims are simply followers. What Hindus should do and can do in India is to track and isolate the 'Lovers of Terrorists' within the community. By weakening them, hindus can weaken the political and judicial support for terrorists. Use your energy and wisdom discretely, effectively. This is the need of hour.
