Is India's new GP cost reduction palpable?
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Early game? Absolutely. I feel like it's given me ten new Pantheons to try and has made India much stronger.
Late game? Barely noticeable. At some point the natural increase in GP costs makes it prohibitively expensive to continue purchasing them. There's just not enough returns to justify it. This means that I'll often only end up producing a few more Prophets than the average Civ.
I recall you mentioned wanting the ability to give India the option of investing into Holy Sites. I gave this a try, but it did not seem to be worth it in the least. Giving up your only way to aggressively expand your religion for tile improvements did not feel good. This was exacerbated by the fact that, due to not having Missionaries, India does not have great bonus yields to choose from their Founder belief. This is without mentioning the fact that India already has fantastic farm clusters due to Reservoir, which makes them less attractive.
I don't know what could be done here without giving India some unique effect for Holy Sites. Increased yields based on Founder? Adjacency bonus to other Holy Sites like for Farms, making multi tile Holy Site super clusters a thing? Building a Holy Site reduces the cost of your next Prophet? Increased Religious Pressure based on Faith output of a city, making Holy Site Faith not pointless (takes dozens upon dozens of turns just to pay for itself.) India's Prophet costs increase greatly with Era, but not amount born? I dunno. Just spitballing ideas in case this is still something you want to pursue.
If the goal was simply to make the early game more interesting and varied, job well done. Mission accomplished. Other than that, I feel like it doesn't impact gameplay much.
As an aside, I feel like a large part of this last part is simply due to the state of Holy Sites in general. They have a lot of yields, but a lot of those yields do not benefit most strategies. What do I care for Tourism if I'm pursuing a Science Victory? etc. This is made worse by the fact that most late game options for scaling GP improvements just aren't that impressive. (Looking at you, +4 GP Improvement Yields policy.) Maybe Holy Sites could be rebalanced to favor their Founder yields more in general? Better scaling options late game? I dunno. Just a thought.