That is true, but then that only applies to Saudi Arabia and Iran, and i already said many times i was against these kind of laws. What would you do, if say, the Jordanian Womens team wanted to wear head scarves?
I personally would be against it, however, with the caveat that it also means no crucifixes or any shite like that to be worn on the pitch. The main problem is that 'political' is too general a term to apply strict bye-laws based on it. For example, I consider a Hijab or a Star of David as a 'political statement' as under a modern definition of 'political statement' that is a statement than promotes a particular ideology, wearing a religious symbol in while representing your country in inherently political.
In short, although there is strong link between theocracy and political statements which is plain to see and other democratic or monarchic systems may not be overtly making a statement though using religious symbols, the making of a statement in inevitable. 'I belong to Jesus' is a political statement and should be banned IMO.