Is this a sentence?Why do they have beliefs on religions?

Is this a sentence?Why do they have beliefs on religions? Do this sentence have any problems? why do we say that meaning of a sentence is not the sum tota Look!This answer is beautiful.A.Why not trying it on C.Why n is this sentence accutate? is this sentence correct? is this sentence correct Is this right sentence? which sentence is right,why? Which sentence is correct?Why? If you can translate this sentence ,I can have a 填空they practice their own religions and have their own way o