The most common way in which people join religious groups is because friends and relatives invite them. Two-thirds of Australian Protestant newcomers first joined their church through someone inviting them.
In the 2006 NCLS church attenders were asked:
Q. Would you be prepared to invite to a church service here any of your friends and relatives who do not currently attend a church?
Michael Pippett, Ruth Powell and Sam Sterland.
Pippett, M., Powell, R., Sterland, S. (2009). Inviting People To Church, NCLS Research Fact Sheet 09003. Sydney: NCLS Research.