niminy, are you suggesting that the Anglican church's refusal to allow women bishops can only be criticised by people who either attend church or are likely to attend church if the sexism is abolished?
That's like saying it is innapropriate to criticise racism in football unless you're a team member, or that you cannot pass comment on sexism in the media unless you're a journalist.
Bollocks to that.
Sexism and homophobia are often used as sticks with which to beat the Anglican church because they're so bloody blatant about it. It is against the law for an organisation to refuse to promote someone to the top position simply because of their sex. It is against the law for an organisation to insist that some of its members cannot engage in entirely lawful sexual practises simply because of their sexuality.
Well, those things are against the law unless your organisation is a religion in which case you get to be as bigotted as you like.
That is unpleasant when it's a religion that has no real power but when we're talking about the Church of England, an organisation that has an automatic right to seats in the House of Lords, then it becomes something much more serious and damn right I'm going to criticise it even if I'm not a member of the club.