There have been and still are many, many institutions in our society that are rooted in the patriarchy, institutions marked by sexist attitudes, traditions and practices, that discriminate either directly or indirectly against women (and/or other groups.)
Such institutions and groups are extremely varied in their remit, history, size and influence. I'm thinking of everything from the medical establishment to the England and Wales Cricket Board, from the Roman Catholic Church to the London Stock Exchange, from Ivy League Universities to the Fire Service, from Trade Unions to the Royal Society (science), from the government in Westminster to the art and literature communities. And, yes, Islam is in there, too.
There are women working with and within these institutions and groups to make changes, to expand opportunities for women, to challenge barriers they face, to shift minds and hearts, to change laws and rules. Maybe they are up against pretty hefty odds, but they still work at it.
Why do they do it? Maybe it's a function of their overall belief in justice and feminism. Maybe it's because there are other aspects of the group they admire and believe in and know they could do so much better if they addressed the institutional sexism. Perhaps they feel they have a better chance of changing from within instead of beating on the door from outside. For many, they identify strongly with what the group is about and feel working within the institution is preferable to turning their back on it entirely and losing an intrinsic part of their identity, their person-hood.
Other feminists may think them daft, wasting their time or even colluding with oppression by even being involved with the institution or group. Perhaps they find the group or institution so "beyond the pale," that they can't even bring themselves to engage with anyone associated with that group. If that's the case, no matter what the women fighting from within do, or say, it will never, ever be enough.
I believe there is a place for women to work within such institutions and groups to push for change. We've seen evidence where that has worked throughout history and around the world - sometimes little steps, sometimes big leaps, but certainly enough evidence to show that it isn't automatically a waste of time and complete separatism is the only way to go.
I think we miss an important trick by rejecting women (and often men as well, don't forget) within institutions and groups who are challenging the status quo one, because in my opinion, we should lend them our encouragement and support from outside, not slap them down as traitors to the cause because they are not doing things "our way." Also, I think there is much we can learn from what they do - what has worked, what hasn't worked, etc., that can be applied to other settings, other situations and perhaps even to our own efforts. I personally believe it takes working within AND without to enact genuine change.
That is what makes me despair about the trajectory of this thread. No matter what those who identify as Muslim and as feminists say about their own experience, or the experience of others, there are some who seem completely unwilling to "hear" anything they say. Furthermore, some seem to feel entitled to define that they can't be feminists because they believe one cannot be a Muslim and at the same time a feminist. They either don't see or frankly don't care that this means they are rejecting the very person-hood of other women, and that does not sit at all well with me. That for me is most certainly NOT what feminism is about.