The National Trust was facing a membership boycott amid a growing backlash over the decision to drop "Easter" from the name of its annual Easter egg hunt.
The charity and Cadbury's faced criticism from all quarters including the Prime Minister, other faith leaders, and members of the Cadbury family over the "frankly ridiculous" decision to rename their annual event.
Members said that they were reconsidering their payments to the National Trust as many took to social media to ask the charity how they could cancel their subscriptions.
The National Trust's event, run in partnership with the now American-owned chocolate company, has been rebranded as "Cadbury's Great British Egg Hunt" when in previous years it was known as the "Easter Egg Trail".
The National Trust maintains that the decision concerning the event's branding was taken by Cadbury.
The changes prompted the Church of England to accuse the Trust's campaign of "airbrushing faith" from the religious festivities.
Theresa May reacted to the news yesterday morning pointing out that she was a National Trust member as well as a vicar's daughter.
She said: "Easter's very important. It's important to me, it's a very important festival for the Christian faith for millions across the world. So I think what the National Trust is doing is frankly just ridiculous."
She found an unlikely ally in Jeremy Corbyn, the Labour leader, who said: "It upsets me as well because I don't see why Cadbury should take over the name, because that's what it's done, it's commercialisation gone a bit too far."
Following the comments the National Trust appeared to back down by quietly editing its webpage to prominently include the word "Easter".
On Monday the website read "Join the Cadbury Egg Hunts" but it has since been quietly changed by "Join the Cadbury Egg Hunts this Easter."
The joint campaign was also condemned by family descendants of the chocolate firm's original Quaker founder, John Cadbury.
James Cadbury said that the decision to drop Easter from eggs and the egg hunt was a betrayal of the "soul, ethos and founding principles" of the company which he found "insulting".
Mr Cadbury, 31, who set up Love Coco to sell British made chocolate when his great great great grandfather's business was bought out by the American firm Kraft, added: "He (John) would have been disappointed.
"He was a deeply religious man and the founding principles of Cadbury's were based on the Quaker religion and helping anyone access all religions, so to drop the word Easter he would have been disappointed.
"If the company were still British owned then I genuinely doubt that this would have happened and there would have been more sensitivity around the issue."
Professor Francis Davis, director of public policy at Birmingham University's Edward Cadbury Centre for the Public Understanding of Religion, which is funded by the Cadbury's family, said: "This comical decision is in breach of the traditions of the Cadbury's family and the values they have always held dear."
Prof Davis also expressed his 'astonishment' that Dame Helen Ghosh, Director-General of The National Trust, should have presided over such a 'comical' decision.
Dame Helen is a committed Catholic, who at the time of Pope Benedict XVI's visit to the UK in 2010 was the senior civil servant in charge.
Meanwhile senior figures from religious groups including Sikhs and Jews suggested the move, which Cadbury's said was designed to make its products appeal to people of "all faiths and none" was unnecessary.
@nationaltrust had family m'ship for 20yrs because I believe in preserving past. Take Easter out of Egg Hunt and I will cancel membership��— Camilla (@camillaalison1) April 4, 2017
Rabbi Dr Jonathan Romain said the decision was "religious political correctness gone over the top", adding: "People from all religions are happy to accept Easter part of English heritage so this is mistaken sense of religious sensitivity. If this was purely a marketing ploy then it has badly backfired."
Jagjit Singh Spokesperson of Sikh Council UK, added: "Easter is a Christian festival and it is important for commercial undertakings not to offend the religious sentiments and traditions in connection with it".
Both the National Trust and Cadbury's insisted that they were not trying to downplay the importance of Easter as it was mentioned numerous times across their advertising campaigns.
In a letter to the Daily Telegraph, Dame Helen pointed out that the word was mentioned 13,000 times on their website, adding: "It is ridiculous to suggest the National Trust would want to airbrush Easter.
But their insistence was not enough to placate members, with one named Camilla writing on social media: "There has been an Easter bunny since at least 1800's. Now it's the Cadbury bunny is it? What commercialism National Trust shame on you. How many times to mention Easter is not the point."
Another, Ann Pearson, said that she was considering cancelling her membership after roughly 40 years as she was "truly horrified" by the removal of the word Easter.
She said: " Why do we consider it offensive to even mention our own religious holidays, it is political correctness gone mad, and, even worse, is only serving to damage cross-faith and cultural relations in this country."
"I would have expected better from the National Trust, they should not have involved themselves in something this political, it is not what they are for and it is wrong."
A Cadbury spokesman said that it was "simply not true" that Easter did not feature as it was mentioned a number of times on promotional materials, their website and their eggs.
"Our Easter Egg packaging also carries the word Easter and these products are only available at this special time of year," the spokesman added.
"Our Easter partnership with the National Trust is also synonymous with Easter, and we make it clear throughout materials that it is an egg hunt, for families, at Easter."
National Trust boss "should have known better"
The head of the National Trust is a committed Catholic who “should have known better” over allegations the organisation allowed the “comical” dropping of the word “Easter” from its annual Easter egg hunt.
Dame Helen Ghosh, the National Trust’s director general, is facing growing criticism - amid claims, vehemntaly denied, that she has presided over the ‘dumbing down’ of the heritage charity.
Dame Helen, 61, was the senior civil servant in charge of Pope Benedict XVI’s visit to the UK in 2010 and is a trustee of two Catholic charities.
She was judged Britain’s fourth most influential lay Catholic in a survey conducted by The Tablet newspaper.
Dame Helen was promoted to permanent secretary in the Home Office after the papal visit was judged a huge success - although it was not without its misfortunes.
The Foreign Office was forced to apologise to the Vatican after a leaked memo from an ideas meeting suggested the visit could be marked with the launch of ‘Benedict’ condoms and that the Pope could be invited to open an abortion clinic. Dame Helen, who was in charge of the Papal Visit team, was not present at the meeting.
Dame Helen quit the civil service in 2012 to join the National Trust as its director general after allegedly clashing with Theresa May when she was Home Secretary.
Professor Francis Davis, director of public policy at Birmingham University’s Edward Cadbury Centre for the Public Understanding of Religion, which is funded by the Cadbury’s family, said: “I am astonished at Helen Ghosh. Having run the Home Office and given her own personal background, it is astonishing. As chief executive of the National Trust, shew should have known better.”
Prof Davis, who was the government’s former faith adviser, added: “If you have been permanent secretary at the Home Office, part of the brief is to understand the diversity of the country and the extent to which religious festivals are mainstream.”