MS Office suite should come with Frontpage. It's pretty straightforward. There are a number of free website templates available. As for "Christian" website templates, well, use Christian icon and/or pix.
But you still have to have a server. If you're connected from home (which most likely your parents are paying for) on a highspeed connection - adsl or cable - most Internet providers give a minimum webspace (10 - 15 MB) as part of the monthly fees. Check that out first.
Getting your own domain name may run you about $30-40 a year.