"in favour of the idea" is correct and usable in written English.
It is used to express support for an idea or opinion. Example sentence: The majority of the board members voted in favour of the idea to open a new branch in the suburbs.
However, he argues in favour of the idea.
Ministers, you may remember, were much in favour of the idea a couple of years ago.
Fifa executives from Asia and Africa were understood to be strongly in favour of the idea.
Some police chiefs are in favour of the idea while others are against it.
He is one of those in favour of the idea that global warming will increase the chances of bigger storms.
Opinion polls over many years have consistently shown around two-thirds of people in favour of the idea.
The Washington Post has come out in favour of the idea.Why has the Democratic mayor of an overwhelmingly Democratic city thrown his support behind school choice?
The evidence and a general consensus argue in favour of the traditional idea that the plates projected upward and were set in two staggered (alternating) rows on either side of the backbone.
Tyrannosaurs may have lived in social groups, or they may not, and this uncertainty makes it all the more important to carefully weigh all the available evidence, not just that in favour of the sexiest idea.
Campbell argues against Frith in favour of the Humean idea that we simply cannot tell in advance of inquiry what causal relations obtain in nature.
At the UFA convention in 1923, a proponent of a provincial banking, George Bevington, made a passionate speech in favour of this idea, bringing most of the membership around to his side.
