In reply, @neurotaylor and I have devised an alternative, all-female list, which I append. (The women/texts in red are those also mentioned by McCrum.) Not all the women included on the list are English and Julian of Norwich, our first inclusion, predates McCrum's first 'moment' (the death of Christopher Marlowe) by 200 years. Our list is not intended to be like-for-like. Nonetheless, it makes a point.
Update: 12 February. Robert McCrum has now published a new list, consisting entirely of women writers. It's generated some comment, which is great to see. No list is ever going to please everyone, and there have been many more than 50 important books by women over the centuries. Further suggestions very gratefully received!