It's as a study finds teaching mums and dads how to communicate with their kids can improve the condition.
The experimental therapy has had a record level of success in reducing core symptoms.
A trial involving daily 20 to 30-minute sessions of planned communication and play activities showed benefits that lasted six years after the treatment ended.
It is the first time long-term effects of such an early intervention have been demonstrated.
Autism consultant Lynn McCann wants the Church to do more to help parents.
"Ask them about their children and get to know them," she said on Premier's News Hour.
"Ask the best way that we can support them. That's really important because ignorance isn't an excuse.
"We need to find out what we can and how that autism is affecting that particular person".
Autism is a "spectrum" developmental disorder affecting about one in 100 people and causes symptoms that vary greatly in severity.
Core symptoms include an impaired ability to communicate and engage socially, and obsessive or repetitive behaviour.
