What part of "expecting Women to be the submissive gender" is generalizing? There are churches that teach that, there is no generalization here.
And on one hand YES, if a church does not allow women to be in any of those roles, it is a sexist environment. It has nothing to do with observation, it is the FACT that there are Christian churches that would not allow a women to be in any role of leadership over the whole church body. most of those will allow women to teach little kids in sunday school.
I once went to a church that had a male pastor (ok, sure, doesn't mean anything according to your assertion), However they taught "Gender roles" and of course , the "biblical" standard was that ANY woman teacher had to have male authority to approve anything they wanted to conduct in their lesson. I mean, seriously, you can dance around this all day long, and it doesn't change that these environments have nothing to do with a real stance of equality for women, the bible is simply used as an excuse for male dominance and the poison keeps flourishing in these environments because women put up with it and keep going.