आसिन्धु सिन्धु पर्यन्ता यस्य भारत भूमिकाःपितृभूः पुण्यभुः च एव, स वै हिन्दुरीति स्मृतः
One who considers this land from Indus to southern ocean as "India" and regards this country as his "pitRu bhumi" (land of forefathers) and Punya-bhumi , he is "Hindu"
About Fatherland - It is translation of original sanskrit word - Pitrubhumi (Land of Pitaras - forefathers). India is land of my forefathers. Ever since human being entered Indian subcontinent from Africa 1 lakh years ago, all my ancestors were from this subcontinent. So India is my pitrubhumi (Purkhon ki zameen in common hindi). All the places, rivers, mountains which I consider valuable and am ideologically and emotionally attached to, are in Indian subcontinent. Hence, India is my Punyabhumi as well. All those who share opinion with me are Hindus.
Hindu and Hindutva ARE geographical confined terms. Hindu comes from Sindhu and means Indian. With Muslim rule, it came to be associated with Indian faiths and with British rule, it was confined to Indian aastika faiths (segregating Buddhists, Jains, Sikhs and tribals). GOI continued this. But people did not. Please do not think of Hindu and Hindutva as Adhyatmik terms. They are purely geographical and hence ethnocentric terms meant for describing Hindus of India.
These terms "Hindu" and "Hindutva" are for denoting dharmarthik aspirations of native brown Indic people from Indian subcontinent who consider Indian subcontinent as their native land and revered land. Hindutva is a subset of Dharma. Dharma is for entire humanity. Hindus (or the ethnic group which today is known as Hindus) are the last custodians and as well as originators of meme-complex of Dharma.
Here "we" are "hindus". And "we" have and ought to have "India". Rest are welcome, but are just visitors. In future when this Nation-state based polity will crumble and the very concept of "Nation-state" will fade, "Hindu" tag will fade along with it and so will "Hindutva". So, in another words, Hindutva is also one of the few Indic responses to "nation-state" concept imposed upon India by Brits after 1857.
Until nation-state exists, Hindus (brown indic people of Indian origin living in India and considering India as their native land and revered land) will have to ensure that their traditions and models (dharmik, aarthik, Kaamik and mokshik) are protected and implemented and their population well-versed with these traditions and models in geographical confines of "nation-state", that is today's "Republic of India".
Native Indic Indian people believing in integral India as their native land and revered land, are Hindus and the nation-state of India (with her establishments, institutions, constitution and outlook) should be built as per the traditions, values, customs and four-fold Purusharthamodels of Indic origin. This is "Swa-Tantra" (self system). And this is what Hindutva including RSS demands.