The phrase "is a saviour" is correct and usable in written English.
It means that someone or something is seen as a source of salvation or help. Example: "The new program launched by the government is a saviour for small businesses struggling during the pandemic."
Tea-tree cool & creamy wash Tea-tree oil is a saviour for those with problem skin.
Facebook really is a saviour – it allows you to contact other people from the comfort of your own home.
Bray concluded that R-Truth needed Y2J right then but he's nowhere to be seen as Jericho is a saviour to no one before the lights had cut out.
Manners maketh the man Big is beautiful Policy paralysis The smart money The Lib Dems reach a fork in the road ReprintsFor ITV, Channel 4 and Five, Freeview is a saviour, because although it is more "multi-channel" than the analogue world, it doesn't have that many channels.
To hard-done-by shareholders and to the employees of companies that he has brought back from the dead, Mr Klesch is a saviour; to many others, he is a grave-robber picking over corporate cadavers.As Klesch & Co's sole owner, Mr Klesch declines to disclose profits; most of the investments have done well, he says, and all are still trading.
To his supporters, the 59-year-old former army chief is a saviour who can end the political turmoil dogging Egypt since 2011 when a popular uprising ended Hosni Mubarak's three decades of one-man rule.
"It's been a saviour for me, as a writer," he says.
"Banksy has been a saviour of this club and I think he appreciates my tenacity.
At the other end Lowton was a saviour, too, his back ensuring Agüero's attempt was deflected away.
The human rights lawyer Mohammad Mostafaei proved to be a saviour for juveniles on death row in Iran.
