A Perth teacher who lost his job after telling his school he was in a same-sex relationship has attacked a national push for uniform laws allowing religious schools to discriminate against students and teachers on the basis of sexuality, saying it risks further isolating some of the most vulnerable people in the community — gay school children.

Craig Campbell's employment as a relief teacher at a Baptist college south of Perth, was discontinued last year.

The practising Christian had been teaching at the school for two years and was previously a student there.

Craig Campbell as a school student. ( ABC News )

The religious protections review, set up after last year's same-sex marriage debate, has recommended formalising how religious schools are able to discriminate on the basis of sexual orientation, gender identity or relationship status.

While state laws contain a variety of provisions for religious schools to turn away gay students and teachers, the leaked report from the review has recommended the process be made consistent across the country.

Mr Campbell said the current national debate around the issue risked further isolating many LGBT+ students at religious schools, who may struggle with poor mental health and a fear of rejection.

"All the research shows that students learn best in environments which keep them safe," he said.

"I think the debate does the exact opposite, it removes their safe environment.

"These are kids who are killing themselves over things like this and a school wants its final relationship with a student to be one of rejection.

"What's the ultimate goal in not allowing these kids within your school?

"Religious schools, their bigger purpose is to provide environments where kids can interact with their faith and so by excluding the students they lose that opportunity. To me, it seems nonsensical."

'Taxpayer-funded discrimination'

Mr Campbell lost his job under a provision in West Australian law which allows faith-based schools to dismiss staff if their beliefs are at odds with the teachings of the schools.

He would not discuss the case with the ABC.

But the school last year said that there was an "inconsistency with his beliefs on sexuality and the college's beliefs".

It also took issue with a photo Mr Campbell posted on his personal Facebook page of him imitating a Belinda Carlisle album cover.

Craig Campbell's school took issue with his recreation of a Belinda Carlisle album cover. ( ABC News )

Mr Campbell has since been employed in the state school system, teaching students in Years 7 to 12.

Prime Minister, Scott Morrison, would not comment when asked by the ABC earlier this week on the specific recommendation, but has now expressed a clear view that no school should be allowed to turn away a student because they are gay.

He stressed the report was yet to be released and had not yet been considered by Cabinet.

Mr Campbell said the review, undertaken by former minister Phillip Ruddock, and its recommendations could backfire on the Federal Government.

"It might appeal to more conservative voters but I think that it is going to stir up anger probably across the general public," he said.

"I think what this looks like is a deliberate attack on some of the most vulnerable people in our community for the sake of winning political points.

"These are taxpayer-funded schools and it essentially becomes taxpayer-funded discrimination.

"I don't think there's a place for it in our world today.

"It denies religious diversity.

"My experience of working in these schools is that there are multiple views on the subject anyway."

Mr Campbell also called on the West Australian government to support a WA Greens' bill to repeal a provision in the Equal Opportunities Act which allows religious schools to discriminate on the basis of sexuality.