"The Freely Project is for the promotion of Linux and Open Source Software within the Christian community."

http://www.thefreelyproject.org/

Using linux is an excellent idea. I am a mac biggot personally ( as I type on my PC ). The number one issue to taking ministries to Linux is meeting a list of requirements that the users must have in order to do their work.

Browser, email, photos, MS Word.

I still find times when people send email formatted in MS Word that I can't read natively on my Mac.

You need to support Digital cameras and edit ( to a limited amount ) photos

Users will need to setup the systems remotely with out any suppoort

I like to use RealVNC for this. Very powerful, but slow over dialup connection.

I thin a lot of tesing would have to happen, in order for Linux to be viable for a non-geek community.