Iam not criticizing you, i have seen this on many occasions and it is my exp. as well, that the moment u say to other person he is wrong without any prove or with the proves are pasted in this post, he will never lsiten to you, other way prove something wrong is to start with the logic, and explain it and then prove them wrong. This way chances are that they might have an effect if not today then tommorrow or later some day, u have given a food for thought by proving ur point.
but what i see here is just an argument and sense of monopoly that no one can touch ( or take panga as u may say) with Islam, My dear friend, every one does it and some of them gets the knighthood because giving them a reasonable answer we are banging our heads with the walls.
Same is the case of Mr. Ghamdi, and same was the case of Mr. Pervaiz.