I really wish the govt would show more interest in the plight of the 'lower' caste rather than just seeing them as a vote bank.
[1] https://www.theguardian.com/world/2015/feb/24/india-modi-rel...
As for evidence of conversions for money/material goods, here's a couple of links for you to browse at your own pace:
https://www.dnaindia.com/india/report-meerut-priest-tries-to...
https://amp.theguardian.com/global-development/2017/aug/15/t...
https://m.huffpost.com/us/entry/4470448
https://blogs.economictimes.indiatimes.com/et-commentary/con...
The Indian "Jati"system is similar to English/German family names based on profession like Mason, Smith, Carpenter or Schumacher.
The Indian "Varna" system is similar to the separation of the church and the state but included merchants. It was guidelines rather than a hard and fast rule.
A new population of untouchables/Dalits were created by the "Criminal tribes Act" that outlawed people by birth.
It is true that caste divisions and inequalities are a reality today but the solution lies in free market & economic development/mobility. This isn't something specific to India alone all ex-colonies like Rwanda, Syria .. have a minority ruling elite coopted by the colonist and the "others".
The Indian "Jaati" system itself was much more flexible and mobile compared to the European class system. The church has been so successful with this narrative that today the most prominent caste clashes and segregation is in the Christian population.
On Christmas and other christian festivals, I personally noticed surprisingly large number of 'poor' people attending church prayers. And I found out they were all converted (though not sure about the extent money played a role).
Depending on the region, such conversion may or may not face any backlash.