A NSW principal who used his high school's newsletter to attack climate activist Greta Thunberg also shared his views on Israel Folau and abortion in the bulletin.
But Rodney Lynn, the principal of Coffs Harbour Christian Community School (CHCCS), has been defended by a major national religious education body, which said it was important parents were aware of what he stands for.
Mr Lynn was yesterday criticised after for labelling Ms Thunberg, 16, a "little girl ... with mental problems" in the newsletter last month.
Several people subsequently took aim at him on the school's Facebook page, with some calling on him to resign.
Mr Lynn has previously aired his views on complex social issues in the newsletter, which is publicly available online and appears to be directed at parents.
Earlier this year, he used it to re-publish a blog post written by the Australian Christian Lobby's Martyn Iles titled "Our World Needs The Courage of Israel Folau".
In the August 15 edition, he dubbed abortion "the barbarism of our time".
Mark Spencer, the executive officer of national policy for Christian Schools Australia (CSA) said Mr Lynn had not done anything wrong.
"When you're talking about a non-government school, one of their key features is diversity — they reflect a particular approach to education and particular view of the world," he said.
"I think it's important for the school community to be aware of what a school's views are on a range of issues so they can make informed decisions whether that school suits their values and beliefs."
CSA represents independent Christian schools, however, Mr Lynn's school is not a member of its network.
The NSW Secondary Principals' Council (NSWSPC) said it was concerned about the way Mr Lynn used newsletters as a personal platform.
The NSWSPC is a professional body which represents the principals of government schools and colleges.
Craig Petersen, the organisation's acting president, said the classroom was a better forum to discuss controversial topics, where there were provisions to teach the issue within the NSW syllabus.
"There are other venues that parents can turn to about views about abortion and views about climate change," he said.
'A very opinionated man'
Although he did not name Ms Thunberg, 16, Mr Lynn made reference to "a little girl from Scandinavia" who was promoting "doomsday waffle talk" in the September 26 edition of the newsletter.
He told students and parents that "your world's future is in the hands of God, not in the predictions of a little girl".
Former CHCCS student Ben Turnbull, 20, claims he was targeted by homophobic bullies during his time at the school, and said Mr Lynn's comments about Ms Thunberg were reflective of a "toxic" culture there.
"I think what he said is disgusting and he shouldn't be in [his] position if he's going to speak like that, especially about children," Mr Turnbull told the ABC.
"I don't think it's OK to say she has mental problems."
The ABC has spoken to students who defended Mr Lynn and said he was a great principal.
"He is a very opinionated man, but everything within those newsletters needs to be taken with a grain of salt," said Matt Crowe, who graduated from the school in 2012.
He said the "outrage is probably an overreaction" but felt the newsletter was "a bit too one-sided" and that climate change was too important to be "preaching" about in school newsletters.
The school, and Mr Lynn, have been contacted for comment.
