The Church of Scientology is already banned in several countries but now it is facing one of its biggest threats from a group called Anonymous.
Anonymous has no leader, its members are secret and already its claimed responsibility for shutting down Scientology websites.
A website video by one member of Anonymous declared war on Scientology.
"Over the years we have been watching you, your campaigns of misinformation, your suppression of dissent," it said.
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"Anonymous has therefore decided that your organisation should be destroyed."
Today Tonight spoke to a member of Anonymous. Calling herself Envie, this spokesperson for Anonymous is not a leader.
The group claims thousands of members of ordinary citizens worldwide, who have now turned their attention to wiping out Scientology.
"We really feel like Scientology needs to be exposed, they're a very secretive organisation," Envie said.
"We think their destruction will definitely come about by unveiling these secrets and making people realise that this organisation is not just a religion like they claim to be, they're definitely a cult and they're a cult that destroys lives."
Anonymous claims Scientology is a business masquerading as a religion and its recent attempts to ban videos of Tom Cruise talking about Scientology were the worst form of censorship and the final straw.
Envie said she does not affiliate herself with any religion.
"Obviously I can't speak for the other members of Anonymous because obviously there are so many of them that I don't really know where they all come from," she said.
The next step in this religious war comes this Sunday at 11am.
Members of Anonymous will don masks and turn out in their thousands to protest at Scientology offices around the world, and in every capital city in Australia.
They welcome anyone who wants to attend and Envie said the protests would not be violent.
"We are incredibly determined," she said.
"There are those of us who have been talking about plans for the next 12 to 18 months."For its part, Scientology is seemingly powerless to stop this underground warfare because members of Anonymous could be anyone.
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