Apart from the nonsense stated by Ticker with regard to legal roots of the modern Indian state, we have an opportunity to examine whether 'Indian' civilisation is a mythological religion-based creation, or a vibrant culture independent of any religion though deeply interactive with it, with two distinct ones in this case. Rather like European civilisation, for instance, or Iranian, Turkish, or Indonesian, or Chinese or Japanese or Vietnamese or Malay.
The point has already been made, numerous times, that India as a cultural entity was well represented by a number of constituent political entities through its history, some encompassing portions of the geographical India, some approximating to the same, and some exceeding the geographical India. Both cultural and political aspects are recorded in history, and are ground realities; it is, in fact, the mythological portion which is the happy hunting ground of Hindu revisionist, Muslim obscurantist and latter-day political propagandist alike. I hope you can recognize yourself in this rogues' gallery.
With regard to cultural India, there are so many pieces of historical evidence, and signs and indicators which continue into today's ground realities, that singularly unfortunate phrase selected, that listing them itself is a monumental task which will take several days even in the shallow manner of this forum. Culture, whether represented in art or in the daily manner of life of people, is profusely present in today's world, and can be traced in cases through the preceding centuries to the pre-Christian era, or in other cases to recent efflorescences based on these earlier foundations.
Let us consider language first, and its concomitant aspect of script.
On an Indian currency note of today, it will be apparent that there are two kinds of languages which are in daily use by citizens of the world's second largest nation. These are those with foundations in ancient usage, dating back to the pre-Christian era, and those which have flowered on those earlier foundations in more recent times. Thus we have, and I quote this from an examination of a 100 rupee note,
From the Indo-Aryan group of languages:
Assamese
Bengali
Oriya
Kashmiri
Urdu
Gujarati
Hindi
Konkani (in Nagari script)
Marathi
Nepali
Punjabi
Sanskrit and
Sindhi
From the Dravidian group of languages
Kannada
Tulu
Malayalam
Tamil
Telugu
None of this mythological, none of this religious.
Coming to the script, the scripts of modern India are written in two distinct forms, those derived from the Sanskrit radix and those derived from Dravidian forms, essentially, from Tamil. Those derived from the Sanskrit radix are based on Nagari script, used to write Sanskrit and Prakrit before the 10th century AD, which was based on the earlier Gupta script. Another derivative of the Sanskrit radix, through the Gupta script, was Sarada, a western Indian equivalent of Nagari, from which are derived a form of Kashmiri which was wiped out by cultural genocide, and Gurmukhi, the standard script followed in Indian Punjab.
The Gupta script was itself derived from Brahmi, which is a script which dates back to Asoka, again, from before the Christian era, and gave rise to Sarada, Nagari and Siddham. Tibetan script, although Tibeto-Burmese is a different language group, is also a derivative of Brahmi, through Gupta Brahmi.
This was the script in which the literature of northern and cis-Deccan India was composed, consisting of a body of literature as large as any other in history, and of a quality which still permits its performance or readership in contemporary times, with relevance.
Of the scripts in which Dravidian languages are written, Tamil script of modern times was derived from southern Brahmi, and was popularized by Pallava and Chola patronage, and displaced an earlier script, also derived from Brahmi. Telugu script derived from Brahmi as well, and was well-established by the fifth century AD. Kannada script (I hope I am allowed to go home by 'diga chauvinists) is a calligraphic variant.
The Silapattikaram, and the other four of the five great Tamil epics, was written in a parallel Tamil Brahmi script, since fallen into disuse, in the first century of the Christian era. Those who have read this classic will recognize that the characters, the places, the social context, the norms, economic relations, trade and commerce and the administrative pattern could be drawn from any other part of cultural India, from the distant mountain territories of the Bahlika to the the river valleys of Kamarupa, or from the valleys of the northern Himalayan mountains, with little or no change.
Nothing religious, nothing mythological.
So, too, if we go through other parts of culture, like painting, or sculpture, or architecture, or dance, or drama, or literature, there is one Indian civilisation.
Nothing religious, nothing mythological. All existent in one form or the other in India today, Ticker, sadly for your thesis.
On the other hand, nothing exists of the IVC but the ruins, lost and forgotten by the people in their neighbourhood, found by a Bengali, and extricated painstakingly by the British, whose supposed misconceptions of the nature of Indian polity, culture and geographical extent you were so scornful about in your sadly mistaken comment.
I hope you have a sense of humour, Ticker, and that you laugh to yourself when putting down your tongue-in-cheek fantasies to raise Pakistani morale. It would be pathetic if it were otherwise.
I have already listed the political formations which are to be seen today, in today's republic that is called India. However, just for the sake of the record, let us look at them again. In the next comment.
Nothing mythological, nothing religious.