I checked your save file, and I dont see any problem with your game here.
You can win easily off of this one, and religious victory by India is not a threat.
On the next turn you will get your great prophet.
Once you pop him (preferably in a city as close to everyone else as possible, because holy cities give +6 religious pressure to every city nearby), then you got your own religion.
That means you do not have to rely on declaring war and condemning heretics, you can use Inquisitors of your own and either wage theological combat with any apostles/missionaries, or just remove heresy to flip a city back to your own religion.
Better yet, getting your own religion will instantly convert every city of yours (to your religion) that has a holy site, and since you already have 3 of those, that means that your religion is pretty safe for a good while.
As for the map in general, you are already on par tech wise with the AI, so you're looking decent here.
Instead of building campuses though, I would settle more cities, you have plenty of land for that available.
Japan is no longer a threat, and him having his prophet in neutral territory, landlocked by your cities is great, it means he can never move that prophet out to found his own religion (unless he declares war, you trade him open borders, or the cities claim those unclaimed tiles).
Settle at least 3-4 more cities, get harbours and commercial hubs down first, and then work on campuses (if you want a scientific victory that is).
You can also go to war with the AI if you want, in that case, pick Crusade (+10 combat strength in enemy lands), convert a city and start fighting on their territory.
You really have nothing to worry about in this game, India will never be able to convert you since you can always fall back on the strategy of declaring war on him and using your horsemen to just kill his missionaries.
As a tip for future games though, I would practice on expanding faster (more cities), and placing districts in better spots.
You do for instance have the Pantanal wonder right near two of your cities, which means +4 adjacency holy sites.
Since you are Germany, you can place down those holy sites without hurting your ability to place down a comm hub or campus, since you get an extra district slot.
This alone will give you a huge boost to your faith income, which can be used to win a religious victory, or to spend on your war machine (by "seeding" a city with your religion to get +10 combat strength from the crusade belief when fighting in the territory of the city you seeded with your religion).
Also as Germany (or any civ really), you wanna abuse those Hansa unique districts to pump up their district adjacencies with comm hubs and aqueducts to really reap the benefits of huge production.
There are some videos online that showcase how you can boost those Hansa/IZ yields to quite some big numbers.
Edit:
As per my last comment in the other thread, I would look into using your horseman to scout out where India and Norway are, and what they are up to.
India has quite a big army (but probably not a real threat), so you should want to keep tabs on him to see if he ever intends to move a large force towards you.
This will allow you to preempt any invasion attempt by switching up your production if you need to.
And if he doesnt invade, you know you are free to expand, improve tiles and get more districts, without any consequence.
