Advocates have criticised a Devonport man for what they say amounts to blaming people for their own disabilities.
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Samuel Waterhouse drew the ire of Coasters at the weekend for a Facebook Live video in which he claimed he could cure any illness at his Sons of God shopfront through the power of Jesus Christ.
The claims of 'faith-healing' were condemned, including by fellow Pentecostal preacher Harry Cuthbertson who said Mr Waterhouse's claims were "dangerous".
On Twitter and Facebook, some said his comments amounted to ableism - discrimination against disabled people.
Autistic woman Geraldine Robertson told The Advocate she had "deep concerns" about Mr Waterhouse's views.
"I am very concerned that claims of faith-healing may put pressure on people with disability who access science-based treatments from not using them," Ms Robertson said.
"Attempts at faith healing can also leave people with disability with a sense of shame and blame that their disability is a punishment, and that they have become ungodly.
"It's a small step from saying people with disability can be healed by God to saying disability is a mark of sin."
Disability advocate Tammy Milne said preaching faith-healing can cause serious harm to disabled people.
"If he says to me I can be healed, but then I'm not, does God not love me? Am I a sinner, am I the devil?" she said.
"This puts too much focus on personal spirituality.
"You can't be promoting that you can cure something and encouraging people to go against their doctor's advice."
Equality Tasmania spokesperson Rodney Croome said it was comments such as Mr Waterhouse's which the federal government is seeking to protect under law with the religious freedom bill.
"The Tasmanian Anti-Discrimination Act currently prohibits that kind of humiliating and intimidating treatment in the name of religion, but the federal government wants to override our Act to remove that protection," Mr Croome said.
"I'm worried that if Canberra succeeds in watering down Tasmania's strong discrimination protections, some faith healers may see it as a green light to blame and shame members of stigmatised minorities.
"If people want to practice faith-healing that is their business, but it crosses a line when people with disability, LGBTIQ people or others are told they are 'broken' and 'ungodly', given false hope of a 'cure', and then shamed as faithless sinners when that 'cure' doesn't work."
Ms Robertson also said Tasmania's current laws need to be protected.
"I am deeply concerned about the impact of the proposed override because our state law restrains faith-healers from standing over and guilt-tripping people with disabilities," she said.
Tasmanian members of parliament have previously written to the federal government advocating the strength of the state model.
Mr Waterhouse has been contacted for further comment.