To show your Facebook wall on a website you will need to first visit this link.
You will need to paste in your churches Facebook URL and then set your desired width and check or un-check the preferences as you'd like them to be displayed.
Once you complete that, hit the Get Code button and copy the code that is in the lower portion and paste it to your website. When you paste it on your site, be sure to switch over to the HTML editor. You do this by clicking on the < > that shows near the bottom of the WYSIWYG editor for content in the CMS.
Look to the right on this support page, that is what the final product looks like.