REV IAN Paisley's Free Presbyterian Church rolls south of the Border in search of converts this summer on a new "evangelical bus".
The £50,000 (€64,000) bus will travel throughout the Republic to fairs, markets and religious events such as the annual Croagh Patrick pilgrimage near Westport in late July. It can accommodate a couple or a small family of missionaries.
While Dr Paisley says he will not drive the bus, passersby should not be surprised to find him standing outside it with a microphone.
"We've been doing this in our own way for a very long time," he said at the blessing of the new bus over Easter at his east Belfast Martyrs Memorial Church.
"There are people who have probably only heard about us through the papers and think we're a bad crowd but that's not the reception we've had and that encouraged us to go ahead and get the message out."
The Free Presbyterians, which Dr Paisley helped found, already attend the Ploughing Championships in the South every year.
It also has churches in Donegal and Monaghan as well as a mission in Cork.
Since its foundation in 1951 in Co Down, the Free Presbyterians have grown rapidly from four congregations to an estimated 18,000 members and 65 churches across four continents.
According to Rev David McIlveen, who helped negotiate the purchase of the bus, many people from the Republic listen to the Church's gospel over the internet and download sermons, particularly those of Dr Paisley.
"We get a lot of interest from Roman Catholic people which may seem strange to some but it's always been our evangelist preaching to reach out to everyone irrespective of their religious identity.
"We don't see any difference between a person who's born into a Protestant home and a person who's born into a Roman Catholic home. We have this common denominator of being sinners," he said.