Hi Mandy
Well I work in Castle Hill and yes there are numerous different churches around here including the big Hillsong group but it really does not have any effect on you if you do not wish to have anything to do with any of those groups. I have been working in the area 2 years and no one has hassled or "invited" me to partake !
Castle Hill and Baulkham Hills have both seen the value of houses drop in the last 2 years as they were part of a major boom 2000-2003. It is a perfect time in the next 12 months to be buying here as it is a buyers market.
We have started looking at schools in the area and there appears to be plenty of choice from public to low cost Private to very high cost private so don't worry about that.
Shopping.....too much choice..you can get everything you need and a lot you don't!
Transport ----- now that's a bit of a problem as the Rail link is not expected here until 2017 (another reason why good buying time now!). There are bus services and bearing in mind the number of young couples with families out here it will never be "good enough" but people do seem to manage. Because distances in Australia are so big most people have cars but you can pick up a runabout very cheap as a second car.
Here are some handy links for property and other info:
Home Price Guide® – Auction Results & Property Prices essential knowledge about the suburbs you want to buy in. Best money you will ever spend
Hills News Local Free Weekly Newspaper
The Hills Shire Times | Hills Shire Local News another Free Weekly
Baulkham Hills Shire Council Local Council services and other important information
First National Real Estate Australia - Free Property Guides - About First National
hope these are of help
Liam