Help me explain to the hard of thinking why the word 'cis' should not be in our public facing document

It's insulting to women, who are just that, women. We aren't a subset of ourselves.

Because 'cis' is about gender stereotyping and makes the assumption that the majority of women comply with outdated gender stereotypes in dress and behaviour.
Additionally, it others gender non-conforming women by implying that they might not be women at all. It is a deeply sexist concept.

And of course, using cis- could also exclude those who do not to identify with gender concepts at all.

It the document related to sex or gender?

If sex then cis is not needed but may cause confusion and hurt

If gender, then a lot more descriptions are needed as many women are not cis or trans ( none binary , gender none conforming, gender rejecting ....)

You also need to check that in using the prefix cis- they do actually mean only those people? I.e. if they use cis-women, does the context mean that they do actually want to exclude eg. female humans who describe themselves as NB, "queer" or trans in some way?

To echo the previous two posters, it:

i) implies that there are other groups of women, and
ii) validates a belief in the existence of a gender identity as a prerequisite, a belief I don't share.

In addition to this, it imposes a way of describing myself that I haven't consented to, which is something trans rights activist are keen on for themselves.

I wouldn't describe myself as a shiksa or a kuffar, and I find the terms a bit offensive, even if people with other belief systems might use them about me.

I would personally describe it as language relating to the doctrines of a pseudo - religion and that the public may object to being referred to by a term which is analogous with heretic.

In a work situation, I would probably do a slightly modified version of this and point out that many people do not identify with the ideological term 'cis' which may lead to less engagement with your document.

https://www.spiked-online.com/2023/06/27/the-problem-with-cis/

Because it implies there are sub groups of women.
There aren't.
There are women (adult human females) and men who identify as women.