It doesn't matter that most Christians don't believe it. Most Muslims don't do violent attacks on civilians, yet they all seem to pay the price either in their home countries or in the US.
It seems world-wide, a hard-right extremist subset of religious believers are ruining things for everyone else.
You might have a point about Catholics in terms of sheer numbers, but... the only people still listening to Catholics are right wing chuds and Warhammer fans - and even the former aren't listening anymore because the Pope is too "woke" for them. The days when the Pope's word mattered are long, long gone. What happened when he gave his encyclical on AI? It made headlines for a day or two then the world proceeded to ignore the silly hat man as usual.
So I stand by my point. The Christians who matter as far as climate change policy is concerned don't care because as far as they're concerned this world just exists for God to burn anyway.