any thoughts?
The Bhagavad-Gita, and the Mahabharata, among other texts are far, far older than the 1800s. Not only because of textual and chronological evidence, but also because of evidence from far-away cultures where Hinduism spread to, ages ago.
Bali, for example. Or for that matter, the Angkor Vat in Cambodia.
As for the mention of Mughal structures in India being built over ancient Hindu temples, most of these claims are likely dubious.
The problem with Hindu nationalism is that the nationalism part has often been supplanted by chauvenism and contempt for religious minorities. That’s a crucial difference with Zionism.
Not to mention that many leaders of the main Hindutva organisation, the RSS and other idealogues like Bal Thackeray have been admirers of a certain Adolph Hitler.