.. it was suggested that the other 1 990 000 people would lie about it because of the fear of Hindu persecution.
You have been to India. Is India the kind of country where Hindus persecute other beliefs? Are not people of various faiths living here in peace, even those who have cut-throat interaction in other countries (the Sunnis and Shias). Bahais got 10.5 hectares of prime land practically free of cost.
"92000 Square Metres of land in Delhi was purchased merely for Rupees 140,289."
https://www.quora.com/The-Lotus-Temple-in-Delhi-belongs-to-which-religion-or-faith
i.e., Rupee 1.5/Sq. mts or USD 0.002/Sq. mts in the heart of Delhi, where the land price is not less than Rs. 15,000/Sq. Ft. It is practically a scam.
Rupee 1,500,000,000 land given for Rs. 140,000 by the Congress government.
Land worth 1.5 billion rupees given for 140,000 rupees. (Land worth 21.5 million USD given for 2,000 USD)
If even then, Bahais claim to be persecuted in in India, it is quite ungrateful of them.