More than half of Kiwis have no religion, new data shows.

Census figures released today shows the proportion of people without religion is now at 51.6 percent.

Massey University Emeritus Professor of Religion, Peter Lineham says Christianity has been declining since the 1960s.

"It speeded up a tremendous amount in the period from 2006 to 2018 - and it's still going on."

Lineham says the speed of people choosing no religion is reducing, suggesting other religions may be replacing Christianity.

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