New warnings by Destiny Church leader Brian Tamaki include the perils of Harry Potter and that the hit children's character lures young people into the "demonic world."

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And in the latest book released by the church leader, Tamaki has also delivered a new chapter on the Kaikoura earthquake saga - and that he predicted the 7.8 magnitude quake, which killed two people.

A collection of four books, dubbed "Revelatory Notes by Bishop Brian Tamaki", are being sold by Destiny for $60. One of them "Demons in my House" contains warnings about fictional wizard Harry Potter as well as observations about the obese and unemployed, and claims about sexually-transmitted diseases.

According to Tamaki, Harry Potter is a tool to recruit people toward evil.

"The Familiar Spirit is the one to lead you into the occult and witchcraft; casting spells and curses. Movies and television has popularised 'occult' programmes like True Blood, Cris Angel [sic] and many others; Harry Potter is a worldwide phenomenon used to 'entice' thousands of teenagers into the demonic world, as well as many other things."

Sex is also raised by Tamaki, penning: "Sexually transmitted diseases would not exist if people did not have sex before marriage and remained faithful to their own spouse."

Sexually-transmitted diseases are not only transmitted through intercourse, but can be transferred through blood, mucous membranes and contact with infected skin.

Tamaki also questions New Zealand's obesity problem and why so many unemployed people are overweight, saying those who claim state benefits should be "skinny".

Last weekend Tamaki released his latest book "Sons of Thunder" in conjunction with a conference for a church project called "Man-Up" - an initiative focused on tackling family violence, depression, obesity, addiction and suicide.

Priced at $30 the book contains more details from Tamaki about the saga which erupted from claims that earthquakes are caused by gays, sinners and murderers.

According to Tamaki, his November 13 sermon - the day before the devastating Kaikoura quake - foretold the quake was coming.

"The earthquake that struck midnight Sunday, the 13th of November 2016 was warned of that Sunday morning at 10:45am, during the Sunday morning church service of Destiny Church Auckland, NZ - that person was me! It was not a prepared or planned message at all - but came at an 'inspired moment' before the sermon," he says in the new book.

Prime Minister John Key has criticised Tamaki's quake sermon as "ridiculous" and "just madness", while an Auckland vicar, reverend Helen Jacobi, said Tamaki's comments are "completely illogical" and compared them to blaming sin for child cancer.

Destiny Church declined comment when approached by the Herald on Sunday.