If, as a non-muslim, I have to keep my mouth shut then I guess our conversation ends here. All I'll say is that you need to be more open-minded to other peoples views and try to understand the difference between discussion/debate and criticism. People are not telling you how to improve your religion or criticising it, they're just expressing a valid concern for people who have no choice but to perform hard work in high temperatures with no water. Most of us don't want to wait until one of them dies before we have our say.