It could very well be but all of those religions are essentially based on the same principles and it is still very possible for the rest of them to attain inner peace although I'm not sure they put as much emphasis on it as they do with Buddhism.

well that's the thing Buddhism has 2 factors that make her so great one is that it's not institutionalized and second Buddhism it's not an actual religion is a philosophy Buddhism is not theistic so Buddhism has nothing to do whit any kind of religion but my original post has joke tough LOL