Gamers have flooded a government inquiry to support the case for an R18+ rating for interactive games, but a Christian group opposed to the change has warned that the strong response was the result of a biased consultation process and that little weight should be attached to the gamers' submissions.

The Attorney-General's department is currently reviewing censorship rules that ban games with content beyond the current MA15+ rating, opening up the possibility R18+ games could be legalised in line with rules for films and DVDs.

Any change would have an impact on the ability for Australians to legally access games such as Left 4 Dead 2, which was banned in Australia last year because of its "graphic depictions of blood and gore".

A campaign by the gaming industry yielded tens of thousands of submissions from game designers and fans frustrated at being denied legal access to games available elsewhere because of what they say is the outdated perception that games are intended for children.

But the Australian Christian Lobby says the surge of submissions is the result of an flawed process that involved a biased discussion paper and encouraged people to fill in a simple template form.