You believing in china because you are convinced that if you were to go to china, there will be china. If you go to china, and there is no china, then you stop believing china. If you are told that china exists, but you can't ever go there no matter how hard you try, and you can't even look at it from across the border, you would be right to be somewhat suspicious of its existence.
Now if someone tells me that I must reorder my entire life because of China, and no matter how hard I try, I can never in this life visit china, nor look at it from across the border, nor talk to anyone who can give me convincing evidence of being from china, and only if I reordered my life to the exact specification of china would china reward me in a way which I can not witness in this life to verify, then I think my suspicion of the motive of the person selling me the story would be greater then even my suspicions about the existence of China.
Now if someone tells me that I must reorder my entire life because of China, and no matter how hard I try, I can never in this life visit china, nor look at it from across the border, nor talk to anyone who can give me convincing evidence of being from china, and only if I reordered my life to the exact specification of china would china reward me in a way which I can not witness in this life to verify, then I think my suspicion of the motive of the person selling me the story would be greater then even my suspicions about the existence of China.