what was its goal?
Its aim was to secure an independent state of Tamil Eelam
Liberation Tigers of Tamil Eelam
 Its aim was to secure an independent state of Tamil Eelam 
how many tamils are there in sri lanka 70% since how long have they been living here? Sri Lankan Tamils have a very long history in Sri Lanka and have lived on the island since at least around the 2nd century BCE. are they genetically linked to other sri lankans? Yes,  genetic studies indicate that they are closely related to the Sinhalese ethnic group in the island. which religion do they follow? The Sri Lankan Tamils are mostly Hindus with a significant Christian population. was there any militancy related to them? Yes, Liberation Tigers of Tamil Eelam (LTTE)
wiki:25603671
Liberation Tigers of Tamil Eelam [SEP] Introduction
The Liberation Tigers of Tamil Eelam (LTTE) (, , also known as the Tamil Tigers) was a Tamil militant organisation that was based in northeastern Sri Lanka. Its aim was to secure an independent state of Tamil Eelam in the north and east in response to the state policies of successive Sri Lankan governments that were widely considered discriminative towards the minority Sri Lankan Tamils, as well as the oppressive actions—including anti-Tamil pogroms in 1956 and 1958—carried out by the majority Sinhalese. Founded in May 1976 by Velupillai Prabhakaran, the LTTE was involved in armed clashes against the Sri Lankan government and armed forces.