I know a couple personally where the woman is atheist and the man still believes.

I don't personally but I'm sure they exist. I'd expect them to be relatively rare, though, because women in my experience are more reluctant than men on average to identify as atheists, to themselves or to others. It is too harmful socially. My wife is absolutely one of those from-the-cradle atheists but doesn't think of herself in those terms. In part because she sees it as divisive, in part because she's had so little contact with and awareness of religion that she's had little utility for the label.

Once I knew a couple where the man converted (from Buddhist) to the Christian religion of his coworkers, but the wife remained atheist.