so are my ideas on the unified china and australia allowed?
There's nothing saying no, mate. I'd say go for it- I just don't think it'd make any sense. China's growing more powerful, and I couldn't see a growing sect of Christianity overthrowing the government, before the government kills 'em all or otherwise subdues them.
And very few nations would willingly merge with another, simply because it might buy them a bit more prominence or somesuch. There's a lotta countries nowadays that would benefit from joining a greater whole- and yet some are growing even more withdrawn.
You do you, man, and the OP didn't say anything about it and the GM didn't say anything about, but I don't think it makes sense.