Actress and same-sex marriage advocate Magda Szubanski has challenged Sydney Anglican Archbishop Glenn Davies over the influence she believes churches hold in the civil domain regarding marriage.

During a Q&A episode dedicated to the divisive debate, panellists from both sides of the debate answered a range of questions touching on issues of freedom of speech to potential consequences of the change.

After Yes-voting Catholic priest Frank Brennan and the Archbishop both spoke of their differing opinions on marriage, Szubanski challenged Archbishop Davies on why he should have the right to tell anyone what they should do.

"I'm less of an atheist than people would think," she said.

"I accept that the Church will never marry me. That grieves me in ways you will never know.

"I'm the one in my family, when I buried my parents I organised every detail of the masses, I wrote the orders of service, I put the pall over my mother's coffin.

"Now I accept the Catholic Church will never marry me but you won't even let me marry outside the Church.

"Fair enough, in your domain, you do what you like.

"We live in a live and let live society. I don't want to tell anyone else what to do. Why should you have the right to tell me or any other person, straight or gay, what they do in the civil domain?"

The actress' challenge came after an audience member asked Father Brennan how Catholics could reconcile dogma with a view supporting same-sex marriage.

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"I believe in my church in the dogma of the sacrament of marriage and I believe Magda cannot have a sacramental marriage in the Catholic Church," he said.

"But I believe she [Magda] can have a civil marriage in Australia and I actually think God would be happy with that.

"In terms of the question of the civil law I see it as quite a different question from that about the dogma within the Church."

Archbishop Davies disagreed, saying marriage could not be separated from the Biblical definition of being between a heterosexual couple.

"I believe that Jesus' words continue to have power and influence and authority today," he said, referring to Matthew 19, a passage in the Bible where Jesus speaks on marriage and divorce.

"I differ here with regard to Frank. It's not just for Christians like a sacramental marriage but marriage is God's design for all people.

"In that regard, I want to propose that to the Australian nation. I do not want to coerce. That's not my job."

'Why can't I have a right to my view?'

"I decided to vote no ... and when talking to my friends who are also voting no, one fact is really clear — and that is those who vote Yes continually tell No voters that we are haters and bigots for our views," another questioner said.

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"Friends of mine are scared to give their opinions. I don't hate anyone. I just have a difference of opinion on how marriage is structured. So my question to you is why can't I have a right to my view without being branded as a hater or a bigot?"

"You totally do, and I wouldn't brand you as a homophobe," Szubanski answered.

"There are some people who genuinely really have issues with LBGTQI people but I certainly wouldn't say all people who vote no are homophobes.

"There's been viciousness on the extremes of either side. I deplore that on either side."

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Archbishop Davies also said there had been "extremists on both sides".

"At a church down in Melbourne recently there was awful graffiti about, bomb the bigots, or crucify the bigots, I think it was. A swastika and a cross being equal," he said.

"Likewise ... some people ... traditional people who believe in marriage, have unwisely offended and vilified people who from the LBGTQI community. That needs to be recognised."

No campaign spokesperson Karina Okotel said she had experienced abuse herself for what she believed, and told the story of a woman who was "licked on the face four times by a stranger" while she was out campaigning.

'Will you accept the survey results?'

To end the episode, the panellists were asked if they would accept the results of the same-sex marriage survey and stop campaigning.

Sorry, this video has expired The panellists were asked if they would accept the result of the same-sex marriage survey.

Ms Okotel said should a Yes vote prevail, she would campaign for legislation to guarantee "religious freedom, free speech, [and] parental choice".

"Although inevitability, those we see are watered down over time," she added.

"I would just be saying I want the politicians to get on and do their job," Father Brennan said.

Archbishop Davies too, said he would accept what people had to say, "because we believe in democracy".

"However, I won't stop saying what Jesus defines marriage to be and how God has defined marriage."

If the outcome of the survey was a No result, Szubanski said she was in a difficult position, referring to the Indigenous referendum.

"Would you have sat and said to an Aboriginal person, 'Do you accept that vote?'

"Because I believe fundamentally in my bones you can't set a precedent where 10 per cent of the population are less equal than others, I will continue to try and somehow get people to understand what it is like for me and other LBGTQI people.

"How profoundly insulting it is to be told you're lesser than and be reminded on an institutional basis constantly."