This Pew Research Center study describes the religious makeup of India’s population, how it changed between 1951 and 2011, and the main causes of the change. The analysis focuses on India’s three largest religious groups – Hindus, Muslims and Christians – and also covers Buddhists, Sikhs and Jains when suitable data is available.
Hindus make up 79.8% of India’s population and Muslims account for 14.2%; Christians, Sikhs, Buddhists and Jains account for most of the remaining 6%. Between 1951 and 2011, the share of Muslims in India grew modestly, by about 4 percentage points, while the share of Hindus declined by about 4 points. The shares of Indians in other religions held relatively steady. Muslims are growing somewhat faster than other groups because they tend to have more children.
There was an urgency to the practice of the original Sikhi; it was a necessity, in some cases a literal case of do or die particularly when the need for militarisation arose. To be fair the very early contemplative form of the faith prior to Guru Hargobind was far from theoretical; it may not have manifested the thunderous vigour of the later form, but it was still a "violent" revolt against the social and religious status quo.
Now in the current era it's become for most a leisurely pursuit; a first world activity of belly-aching over shariat ritual or at the other end of the spectrum a desire for a structureless, anything-goes ethos. This is partly the result of all forms of belief systems being degraded by a wider civilisational decline IMO.
If he is trying to get the youth back into reading Punjabi - perhaps keep footnotes for some of the lesser used vocabulary to give context. A good representation of what I am saying can be seen in this book - https://pippal.org/