Have you [del]stopped beating your wife[/del] gotten out of ISIS yet? 
Or you can do what I do: proudly claim your Catholic identity, while at the same time making it clear that you don’t attend church or believe in Jesus or the Bible. It dilutes their brand.
Brother QuickSilver, we haven’t seen you at a beheading in over a month. Allah willing, we’ll see you at the next one. Because, well, that’s a fine head you have… shame if something were to happen to it! God is Great!
I wish I could just do that with the IRS. Some try but it does not work to well.
I don’t want to move.
I don’t want to go to jail.
I can say taxing is bad or wrong or Catholic.
None of these seem to work.
If you are asked, Denial Denial, Denial… 
Captain,
It ain’t like a gym membership. You can just ignore them. You know, like the white horse.
Yeah, really. You can just walk away, in fact the only method is to just walk away. If someone asks in a survey, we can just just leave it blank or write in whatever it is we actually are.
If someone can’t just stop caring about what the Church thinks about them, then maybe they have not made a clean break. It’s not as if the Church will demand that the hospital allow a Priest to your bedside against your wishes as you lie there on the ventilator, or will get acourt injunction against you getting married by a UU minister.
Best part of it, you can then ignore people posting “Look, the Catholic Church did/said [bad thing X]; let me hear Catholics condemn it yet justify remaining Catholic!” on any given subject.
The number of people who go by the label “recovering Catholic” makes it clear there’s some way in which the “change is forever” as the USMC has it. The OP may be struggling with how to get over that.
Or maybe it’s like the McCarthy era’s infamous question: “Are you now, or have you ever been a …”
After a very unpleasant argument with the Priest at my last Catholic Church, I walked away and never gave it another thought. They can consider me a member as long as they like.
You need to file a form 32-a/3:16 at the Post Office.
Talk to the bishop of your diocese. Offer [del]a big bribe[/del] to make a big donation to charity if he will to the “bell, book, and candle” ceremony for you.
It’s like the Hotel California
If it bothers your conscience, make a public announcement of some kind. Write a letter to the diocese, make a Facebook post, buy a bumper sticker, etc… Otherwise, just not be Catholic.
Or…, ask the Mormons to baptize your ancestors.
I am intrigued by your methods and would like to subscribe to your newsletter.
The Mormons and Catholics are both evil organizations; pitting them against each other in this way is awesome. Going for a scorched heaven tactic. Skald would be proud.
You click your heals 3 times and say “there’s no place like home”. You then have to play the entire pink floyd album “Dark Side of the Moon” backwards. Done. The Pope will then personally go down into the catacombs and pull your library card. You have to turn in any Catholic school girl uniforms you’ve been using to pleasure yourself with.
Or, and I’m just throwing this out, you can do what every other person in your situation did and simply stop going. Either method works.
This.
I haven’t gone to Mass in decades. I just quit going. Nobody takes attendance. Nobody’s come after me to drag me to Mass. Nobody’s come to me to say I haven’t been to Confession lately. Nobody’s billed me for missed offerings. Really, truly, all you have to do is stop identifying yourself as Catholic. For that matter, you don’t have to identify yourself as anything. It’s nobody’s business.
Yeah, if it makes you feel better to do something, then do something. Writing a letter to the diocese sounds perfect.
Then they can call up the pope who will descend into the deep dusty vault where the giant TOME OF CATHOLICS-NO-MORE is kept and formally inscribe your name with sanctified ink made from walnut shells and Mother Teresa’s urine.
Santa Claus?
Why, you can have them when you pry them from my… um, er… nevermind…
…nothing, I said!!
I think see what you mean – it’s easy to get out of catholicism, the problem if any is to get the catholicism out of you?
Well what if they come looking for me? They could call us on our phone at home if they wanted too. What would we do or say at that point?
Are you under the impression that being a lapsed Catholic is like going AWOL from the army; that the clerical MPs are going to show up at your door on a Sunday to drag you to church?