Christian parents who home school their children in NSW have admitted they teach creationism as part of science, despite it not being part of the state's curriculum.

Parents, teachers and students from across the state have told a parliamentary inquiry into home schooling they consider creationism, the belief that the universe was created by God, to be a valid scientific theory.

Christian parents of home schooled children in NSW believe creationism and evolution should be taught equally as valid scientific theories. Credit:AFP

Representatives from the Home Education Support and Action Network, where the majority of members are Christian, said they believed creationism and evolution should be taught as equal theories. And the four teenagers who presented evidence to the committee on Friday said they believed creationism was a valid scientific theory.

At the hearing on Monday, the general manager of Australian Christian Home Schooling, Dr Terry Harding, said creationism was taught as part of science but accepted it was not a scientific theory.