Questions are being raised about whether a politician's religious beliefs are of public interest.

Christchurch-based National MP Hamish Campbell has admitted to TVNZ  a connection to a religious group embroiled in alleged child abuse allegations.

The group, dubbed the Two By Twos, has no official name or buildings, is not registered as a charity, and its members meet in homes. 

Religious historian Peter Lineham says he believes some claims are against preachers.

"The only aspect that is concerning for people in the group is this - that because it's so secretive, the Two By Two preachers are held in such respect that an abused person's story would probably not be believed."

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