A group of parents in Victoria is challenging the Department of Education and Early Childhood Development in VCAT (Victorian Civil and Administrative Tribunal) to fight for fairness in the discussion of religions in state schools.

The group, called Fairness in Religions in School, believes "Sunday school lessons" by church volunteers should be replaced by "culturally diverse and unbiased" classes, according to a report by the Herald Sun.

At least three parents are expected during the hearing to present evidence that their children suffered discrimination on religious grounds at government schools in Victoria.

Parents' group spokesman Scott Hedges told the Sun the group did not oppose teaching Christianity in schools, but it calls for necessary actions so that religious studies are culturally diverse and unbiased.

"What we want is religion taught by teachers as cultural studies," he said.

In reaction, Lyle Shelton, a spokesman for the Australian Christian Lobby, told the Sun the change the group is demanding would defy Australia's cultural heritage.

"Religion has been taught in our schools for more than 100 years and as far as I know it hasn't done too much damage," he said.

Meanwhile, Australian Education Union Victoria president Mary Bluett has expressed her support of Fairness in Religions in School, saying the group could revolutionise how religion is taught in schools.

However, Ms. Bluett said, a revolutionised discussion of various faiths in school would require extra resources, which the primary schools do not currently have.