>I'm interested in creating or adapting an online calendar program for our church. Does anyone know of a good resource to create or acquire an online scheduling/calendar program?

Check this out
http://www.webcalendarcreator.com/
http://www.visualasp.com/monthview.asp
http://www.hotscripts.com/Remotely_Hosted/Calendars/
http://www.webevent.com/purchase/