Yes, most religions have the "us-against-them" mentality coupled with a superiority complex. I agree this applies to Judaism, Christianity, Hinduism, etc. My argument is also viable against them.
But let's focus on Islam for a bit. Correct me if Im wrong, but mainstream Islamic sects like Sunni and Shiite are totalitarian right? what I mean is that there are no seperation between private religious life and your public life. You must practice your Islamic beliefs in private lifes, in your public working life, everywhere you go and everything you do, etc. This carry over to politics so that you should not have "seperation between state and church" like in US. Everything must be submitted to Allah such as government, education, work,family, private life, etc. Correct me if I am wrong but isn't this what mainstream muslims believe?
The problem is when you have a minority muslims community embedded in a non-muslim country. The laws of the non-muslim country will be contradictory to their Islamic beliefs. So how do you create laws that can accomodate both? you said "laws designed by countries must give them right to practice their religious customs freely" but is that possible? I gave the example before, about a muslim decision to leave Islam. Say a Uyghur muslim girl wants to change her religion, the law of the country said she is free to do it, but her Uyghur muslim community will say it is their religious custom to punish her. so how can you design laws to handle this kind of situation? there will be a conflict of opinions and customs between muslims and the non-muslim country. This is just one small example.
So I'm not sure if it is possible to "design law" to accomodate both the muslims and non-muslims. If you make one happy, you will upset the other. Somewhere on the line, someone will have to compromise their beliefs, but who? and where should you draw this line? you want to wear burqa in your house? ok. How about in the school? hmmm. how about in a bank? no way. Where do you draw the line? not sure, some will still be upset if she only allow to wear them at home. Maybe just ban it altogether, less headache? don't know. Its easy to blame the non-muslim states for not relaxing their law, but how come never blame it on the muslims for not relaxing their own law and customs?