Once well-known for its brothels and pubs that opened at dawn, the Western Australian gold mining city of Kalgoorlie-Boulder is playing host to one of the world's most famous evangelists.

Will Graham, the grandson of famed American evangelist Billy Graham, said he had heard about the city's previous 'sin city' reputation.

Mr Graham is in the Goldfields after accepting an invitation from local businesses and the church to spread the word of Jesus Christ.

"God's the only thing that can change people's hearts," Mr Graham said.

"Our heart is affected by what we call sin, which could be lusting after a woman or putting other gods in front of the one true God, and that could be money or gold."

Mr Graham, 43 is the third generation of Grahams to evangelise under the banner of the Billy Graham Evangelistic Association (BGEA).

He has been conducting his crusade-style events called "Celebrations" around the world since the mid-2000s.

Faith can help Kalgoorlie

As Kalgoorlie-Boulder faces an increase in crime and anti-social behaviour, he believes religion has a role to play in modern-day society.

"I know in this community, by talking with the mayor and city councillors, they were all telling me about how bad things were and they really want to make (the town) more family-friendly. And most of them concluded that faith needs to play a role in that," Mr Graham said.

"When you have a community that puts faith first and you see people come to know Christ, you can see things (change) take place.

"There are some things the church can do to help promote and change, but at the same time society as a whole is going to have to change.

"Once you start turning one person, and then another person gets changed, and then another, and it becomes like a snowball, and you'll see that society changes.

"Some of those problems you have in the community will start to melt away."

Mr Graham will spread the word through several community concerts, with hundreds of people expected to attend.

Marketing to the masses

While the last Census saw nearly a third of Australians, or 30 per cent, identify as having no religion, Mr Graham said marketing the message of Christ was still important.

"It may not be the same proportion but that's true [people turning away from religion] across America and across a lot of different places — it's not just here in Australia," Mr Graham said.

BGEA buys online advertising in a bid to encourage people to the church.

Mr Graham estimates the website has had 11 million visitors that have been directed by internet searches.

"Google sells words and we buy them at a premium," he said.

"When people type in 'Is there a God?' or 'Does God love me?' they get a search page, and the Billy Graham Evangelistic Association is number one or two on that page's list."