A bit of a run-on sentence, from http://stormsandpower.blogspot.com/2014/12/mormons-ex-and-still.html. The pertinent part is bolded:
For me this work raises other questions especially at this time when so many people seem troubled by the facts of Mormonism’s past and the politics of its present as to whether that ex- of ex-Mormon means you can no longer define them as part of the experience of the Mormons as a people.
I think that for a lot of people, that's true. Being "Mormon" doesn't necessarily mean being a member in good standing of the modern, correlated Church of Jesus Christ of Latter-day Saints, no matter what its leaders say. It's more of a cultural identity, like being Jewish, and there are people who cherish and embrace that identity even as they question Mormonism's basic doctrines or historical foundations.
Personally, though, I see myself as less of a participant in the Mormon identity, and more of a victim of Mormon culture and institutional Mormon religion.
Politically incorrect, adj.: "True, but we pretend it isn't"
It's politically incorrect to use the v-word in today's society, where everyone is an ubermensch and can breathe lightning and decide whether or not something hurts them. But you can't really have a conversation about things like "victimization" and "victim-blaming" without there being victims.
The word has come to mean "morally deficient person who dwells on past grievances and blames others for her own flaws," when it really just means "person who's been wronged." And while I'm okay with some people I'd otherwise call abuse victims choosing to identify as "survivors" of abuse instead, I also think that term places abuse in the realm of natural disasters and acts of god. Things that just happen on their own, that you can't prevent and can only learn how to deal with.
It may seem that way to abuse victims / survivors, since abusers choose people who can't fight back as their targets. But in my experience, the reason abusers blame victims -- and telling them they can't call themselves victims is a form of victim-blaming -- is to keep them in an abusive situation, both mentally and physically. If they're the ones causing the abuse, there's no need to try to escape or seek redress; they just need to make themselves worthy of not being abused anymore.
And that's what Mormonism does
To a lot of people outside the institutional Mormon church, with its political activism, and to a lot of people inside it. Who don't fit into Mormon culture, but don't have a meaningful choice about what culture to participate in.
I wanted to call myself Mormon, but kept being reminded that I made a very poor one.
I was "unworthy" of their sacred ordinances and coming-of-age rituals, because I was honest in Bishops' interviews. I was constantly reminded of how different I was from the hand-shaking, back-slapping, neurotypical Mormons around me, and when my mother of origin saw me cringing from physical contact she chastised me for it.
I don't know how many youth dances and "young single adult" activities I spent pacing in driveways, parking lots, and darkened hallways, either listening to my MP3 player or watching the shadows get longer.
I don't know how many lessons and talks I sat through where people told me that the technology which enabled me to live a halfway fulfilling life, connect with people who valued me for who I was, and have experiences I never could otherwise, was an irrelevant worldly distraction.
And when I finally left the Mormon church, and started telling people about the abuse I received at the hands of my Mormon family, all the Mormons I talked to about it had two reactions: They felt very sorry for me, and they distanced themselves and their culture from the abuse, with canned statements like "not all Mormons are like that" and "our church teaches against that." Even though my parents of origin were, and as far as I know still are, "worthy" members who were never chastised or held accountable by the church for their actions, and who used its teachings to justify (and its power structures to enable) hurting me.
Meanwhile, my interactions with church members and leadership were major factors in my becoming suicidally depressed.
So if a non-mormon leaves the Mormon church
... can she still be called an ex-mormon? I don't know.
I know I've always been fascinated with Mormonism, but it's become more of a morbid fascination since I left. Their culture, doctrine, and practices basically embody abuse and rape culture and kyriarchy, and any time I need an object lesson for "what not to do" I can use them.
I also know Mormon culture has influenced me. My method of prayer is still very close to theirs, even if the object of worship is different, and their teachings on sexuality are the reason that I'm such a prude. :P Not because I'm okay with slut-shaming, rape victim blaming, and having adult men ask kids of all genders about their sex practices one-on-one behind closed doors, but because the shame I internalized from those teachings is something I may never be rid of.
If there's anything (arguably) positive I got out of Mormonism, it's being unafraid to be different in public. Nowadays, the institutional church's PR machine is spending millions of dollars to make Mormons appear normal, or at least bring them up to Mitt Romney levels of normalcy. But I was raised with the thought that I was supposed to be part of "a peculiar people," with beliefs very different from everyone else's, and I should be unafraid to share those different beliefs.
I like to think I've learned some about boundaries since then. But as you can see from the sidebar, I'm still okay with being different, and with explaining my differences to others. It helps that the only way we know how to describe ourself truthfully is to use different words, and pronouns, than others use.