From your description it looks like they're Muslims and you're Hindu/Christian. Making you sell the property is their aim. You should decide whether to yield or fight. It depends on your capabilities and there'll be risks

If you are ready to fight 1) Join BJP/RSS to begin with. Becoming a sanghi on paper for survival is totally fine. 2) Get some dogs if you're able to manage it. Looking after pets is not an easy job. Rottweiler is good but you must train them properly or else it won't end well 3) Walls and gates should go high with more CCTV cams to capture whatever they're doing, not just as proof but for your own safety 4. a) On the walls or as placards, use some relevant quotes from their holy book that might make at least some of them fill with remorse and shame for the sin they're committing to you and your innocent family OR 4. b) If you need to go extreme, pork ghee will help you 5) With enough CCTV footage, you should meet local body members, police, their priests. If the truce didn't work out, you should try the social media in a full blown sanghi way and hopefully sanghi IT cell would also back you aggressively

If you're not ready to fight, you must leave the place. Just make sure it's not a distress selling and get yourself a decent deal