About the peace gatherings and fosterings,sure,religions unite,but only the people of the same religion. Others are discarded and seperated from. This is not exclusive to religions only,of course. Any group(political party,nations,ideology followers,even fandoms) unite the members of the group while seperating them from other groups. And this,naturally,causes all sorts of conflicts,from simple prejudices and hatreds to warfare.
As for the establishments of hospitals and medical advancemets, you would be correct. These is a small group like that in a vliiage where I live called "??????" (serbian for "Joy") which gives stuff like food and clothing to the poor,and that is probably the smallest of them all. Still,organisations like that,no matter how big they are and how hard they try,can make the bloodshed and crimes against human Consciousness and Mother Nature disappear(mostly because they're still happening as we speak). I aprecciate the effort,but if your driving force is a fantasy,you're doing it for a wrong reason.