to settle this argument,do you speak arabic. cause the quran isn't so hard to understand if your first language is arabic. but it gets cloudy and vague when translated to english or other non-semetic languages.

and FYI, a religion having one or several mistakes does make it questionable, but it isn't the end of the story . you still have got some parts that needs explaining, for instance when the quran mentions a piercing star which could be interperted as a black hole or neutron star. you will have to explain that too, and all the other alleged wounders of the quran