Then why do religious people think they can comment on science?
Dawkins, was religious as a child, he then started looking into scriptures and the likes and found errors, lack of evidence, etc. He started questioning the assertions made by vicars, priest, etc.
They could not give satisfactory answers. So he realised that god was man made and wrote a book explaining his thoughts.
If you ban non-religious people from writing about religion it gets a free pass. Religion is an idea, just like capitalism or socialism that should be scrutinised.
Look, the book is fine, but it does not claim to be a 'scripture' or a 'revealed word', it is just a book. A book that is easier to read and less ambiguous than any of the so called holy books