Fortunately our Prime Minister is a humble person and disavowed this particular ascription. Some leaders around the world today might have accepted the ascription!
But I think it was a brilliant use of the word “saviour” because it is exactly what the biblical talk of “saviour” is about: there is peril, danger and risk to the people - a desperate need for the people to be saved - for a “saviour” to come and deal with the peril, turn aside the danger and diminish the risk to health and wellbeing.
From Joseph, Moses, assorted judges and kings through to our Lord Jesus Christ himself, the Bible has many “Israel’s saviours”. The Bible as a whole is a testimony to God as Saviour - whether sending saviours when Israel is in trouble, or intervening in other ways, or finally and ultimately coming in human flesh to save the whole world through Jesus Christ.
To the extent that NZ has been in peril, danger and risk from Covid-19, the leadership of our Prime Minister and her Government has, indeed, saved us (so far ... obviously this particular moment in history has some way to go).
Generally, in respect of evangelism today, “Jesus is your Saviour” or “you need to be saved” begs the question “Why?” Mostly in the West people don’t feel a need to be rescued from any peril, except possibly the stock market crashing or the housing market keeling over.
We need - obviously - to explain the “what” of our need for a Saviour and that takes quite a bit of work in which “sin” and “judgement” are almost forgotten from our culture.
But the Labour Party official who invoked Jacinda Ardern as “NZ’s saviour” showed that there are conditions and situations in which the explanation may be easier to make - not that any of us wish for a global pandemic to occur so that we have an imminent and terrifying threat to our wellbeing.