No, its about the message, not the messanger.
There's all this obsession about the messanger, and I think its not very important.
Its not an obsession, the messenger does matter quite a bit. You are right the message is important but how it get interpreted depends on the messenger. This does not only mean male or female; had Jesus been born in a rich noble family the whole "it is easier for a camel to go through the eye of a needle than a rich man to enter the kingdom of heaven" would seem kinda hypocritical. Sure in the end this was still twisted around or shoved aside and interpreted in many ways to allow the church to get rich, but the initial interpretations and the prophets initial impression on people would have been different thus affecting everything else in the process.
For the most part Jesus seemed to ignore the whole gender debate for the most part and opted for the socio-economic one instead. Had he been a woman I am certain somebody would have asked something about it in one of his sermons and thus it would have been much more prominent in at least one gospel.
Change Christianity in anyway and you most certainly also change Islam. Thus pretty much affecting the beliefs of over 2/3 of the world if not more. Completely changing culture in the process as well.