Hi Croys,
I'm sort of late seeing this post, but wanted to respond to it anyway. You can certainly still use your current web site and Oracle database; however, Fellowship One WebLink includes a robust Form Builder tool that can create a custom form for your VBS registrations. The huge benefit of this is that the form can be directly connected to your VBS activity, which means that everytime a child registers, he/she gets an assignment. Assignments help you create rosters, form letters, and mailing labes; check kids into VBS through Fellowship One Check-in, or post manual attendance after the event; and most importantly, provide you with up-to-date communication information for the family (gathered through the registration process).
That being said, if it's not feasible to move to WebLink, you may use the application program interface (API) Data Exchange to push the children's information into Fellowship One from your Oracle database. As user Kevinito showed in his post, all data exchange calls are XML based and can be uploaded manually through the Admin tab or programmatically using any language that allows you to push a string of text across HTTP (C#, Perl, PHP, etc.).
God bless!
Tara Coulson
Fellowship Technologies Education Services
Tara Coulson
Learning Specialist
Fellowship Technologies