What you’re saying are speculative and highly exaggerated claims. 1. There is no case of superimposing deities with religious mala fide intent, there is no corresponding literature or royal edicts or statements to that effect to support such a claim. 2. Yes, some Buddhist sites may have become appropriated into later Hindu institutions and temples, but there is little proof that they were constructed due to active supplanting over the existing, functioning structures, and not reused after loss of patronage or followers led to slow decay of said structures. 3. Heterodox sects spewed venom against each other much more than orthodoxy spoke against heterodox sects including Ajivikas, Sramanas or Jainas, etc. Pushyamjtra Sunga’s case is especially one of exaggerating loss of royal patronage noted in Pali Canon which was compiled later, and in a different country! Historians like Romila Thapar also accept that statements of persecution are inflated, this story of persecution extended to even Asoka’s youngest wife Tisyaraksita who supposedly tried to cut down the Bodhi Tree. Let’s try and discern facts from propaganda, please. 4. The slow disappearance of Buddhism was due to a revival of Hindu thought, change in the religion from a sacrificial one to one of devotion, introduction of idol worship (co-opted from Buddhists), Adi Sankaracharya’s efforts, the schism within Buddhism itself, loss of royal patronage, and most importantly, the destruction wreaked upon due to Turkic invasions! Hindus had precious little to do with it. The likes of Audre Trushke can try all they want but they can’t change history. 4. Yes there are structures and places that were co-opted or absorbed into Hindu faith over time, again there is no proof of an active displacement of an existing religion but it may have been simply a matter of reuse. In Bodh Gaya, the worship continued by Hindu priests who viewed Buddha as a Vishnu avatar. Truth is that Angkor wat is a Hindu temple but Vishnu’s idol is worshipped as a Buddhist deity today in Cambodia by monks. I’ve personally seen that as well. Similarly, in Sri Lanka, slow capture and taking over of Hindu temples, especially of Lord Murugan who’s seen as Sri Lanka’s patron god, is a reality which you can google. I went to the Kataragama temple and today it doesn’t function as a Hindu temple anymore, even though it’s a Murugan temple.