Senior British imams have said the depraved terror network is being eroded by defections as the promise of an Islamic paradise outlined in laughable propaganda had failed to materialise.
Power cuts, food shortages and barbaric punishments for even minor 'crimes' have put off many wannabe jihadis who had made the journey to ISIS-strongholds in northern Syria and Iraq.
The claims form part of an online magazine produced by British Muslim scholars in an attempt to counter the well-oiled ISIS propaganda machine.
Haqiqah states: "Now ISIS in their desperation are telling Syrians they are committing a 'major sin' in Islam if they seek protection in the West.
"According to Daesh [ISIS], this makes thousands of Muslim refugees who are fleeing unspeakable oppression from Daesh, other groups and Assad 'apostates'."
ISIS controls vast swathes of Iraq and Syria
Haqiqah - which means reality - seeks to challenge the hate-filled ISIS propaganda 'magazine' Dabiq.
It's first issue was launched earlier this year and has been downloaded more than 75,000 times.
The latest edition, published today, argues the current migration crisis in Europe is proof that the notion of an Islamic state has failed.
ISIS is pumping out nearly 40 propaganda messages a day to convert Muslims into extremists.
An estimated 30,000 foreigners have entered Syria alone to join ISIS, with a significant number of Britons amongst them.
But the group of moderate British muslims behind Haqiqah has set out to "expose the reality behind ISIS".
Shaukat Warraich, editor-in-chief of Haqiqah, said: "Daesh is failing on multiple fronts, it is becoming increasingly desperate.
"The mass exodus of refugees has exposed their false claim of having established a 'Caliphate' for Muslims in the region."
Dr Qari Asim, a senior editor at the magazine, added: "The reality is that Daesh continues to put out a huge amount of propaganda and lies, despite its promises being exposed as falsehoods, which is why a continued effort to reclaim the digital space from terrorists is so important.
"In its desperation at its own failings, it has told Syrians that they are committing a 'major sin' in Islam if they seek protection in the West. According to Daesh, this makes thousands of refugees apostates. This is a wicked and inhumane lie."
ISIS plotting to fight back against Russia with BABY BOOM to produce more fighters
EVIL Islamic State (ISIS) militants believe they have the answer to survive Russia’s onslaught in Syria – sparking a jihadi baby boom.
In a move that suggests the ISIS army is failing to convert more people into extremists, the brutal terror group's leaders are plotting to prop up its self-declared nation by pushing young women to get pregnant.
The ISIS propaganda machine already boasts nurseries, maternity wards and children's hospitals, while the regime's twisted leaders are preaching to fighters and their jihadi brides - many of whom are captured Christian and Yazidi sex slaves - about their duty to breed.
Areas under ISIS control in Iraq and Syria have also been flooded with advice on how to raise a jihadi baby, with mothers encouraged to indoctrinate their children with the group's poisonous ideology as young as possible.
Clinton Watts, from the Foreign Policy Research Institute thinktank told Fox News: "The idea of creating families to live within their Islamic State also provides further validation of ISIS vision as a legitimate nation unto itself.
“ISIS believes the more people they can create in their image the better, and those born into violent ideology are usually the most committed to the course of their life.”
ISIS battalion Cubs of the CaliphateIG
ISIS have resorted to using their 'Cubs of the Caliphate' battalion
Jihadists have frequently posted sick photos of their offspring clad in the terror group's chilling black flag, as well as surrounded by guns and grenades.
Mothers are even told to let boys play with toy weapons rather than watch TV.
The group have also been encouraging foreign extremists who are medically trained to come and work in their paediatric wards, such as Australian doctor Dr. Tareq Kamleh.
It comes as ISIS faces its most perilous moment since declaring its 'caliphate' in June last year.
Russian president Vladimir Putin has followed US-air strikes by flooding Syria with fighter jets, helicopters, tanks and thousands of ground troops with the aim of wiping out the jihadists.
Baby in Islamic StateIG
Jihadist parents have filled Twitter with sick photos of their babies posing with weapons
ISIS in RaqqaIG
ISIS militants parade through Raqqa
With their existence under threat, it has made ISIS bosses ever more desperate to raise thousands of newborn jihadists under its vile command.
They have resorted to using their under-18 'cubs of the caliphate' battalion as suicide bombers, while also training the youngsters to behead non-believers.
The jihadists determination to expand from its terror roots into becoming a fully-functioning state is most prominent within its self-declared capital Raqqa, northern Syria.
Activists in the city have detailed attempts to establish the group's own currency, identification cards and nursing and medical schools.
Anne Speckhard, a professor of psychiatry and security studies at Georgetown University, Washington D.C., said: "ISIS is not only a terrorist group, but in the business of state building.
“One of the central tenets of ISIS recruitment is their promise to build a utopian state where citizens will be able to live by Islamic ideals.”
Those who have escaped areas under the militants' extremist rule have reported widespread hunger and huge problems with water and electricity supplies.
This is affecting their ability to raise a new jihadi army within their territories as they face a battle to survive.
Daniel Koehler, from the German Institute on Radicalisation and De-Radicalisation Studies, said: "They have massive problems paying the doctors and keeping the facilities running with power, equipment and medical supplies.
“ISIS has even tolerated things like men and women working together in hospitals simply because they need the staff to continue and didn’t want them to flee.
"The situation is miserable.”