On the Saudi flag is the Islamic confession of faith, which in English reads, "There is no god but Allah and Muhammad is his preophet". But what is the sword doing here under this text? A sword is not made to cut vegetables or grass but to fight with and cut human beings who in conflicts are perceived as your enemies and opponents.
A sword is a symbol of military and physical power, violence and threat of coercion, not of peace or humanity.
Why should the Saudi Kingdom abuse the holy confession of all Muslims by showing this symbol of violence? Why not to show the symbol of a book instead that signifies knowledge, wisdom and humanity?
Most Muslims believe that their religion stands for peace and humanity. But by showing a sword on their flag, what sort of signal are the Saudi dynastic rulers sending to the rest of the world about Islam, its universal message of love and fraternity?