What Web Framework are you looking at? You could still use ideas from other websites to build a Church website. If you are planning on building one, I imagine you'll need a Content Management System (CMS), and I'd highly recommend Wagtail -- an excellent CMS built on top of Django. There are two excellent Wagtail projects you can learn a lot from on Github:
The ideas from these projects helped me develop a cookiecutter template for starting new Wagtail projects. Hopefully this helps.