I am going to be submitting/creating an app that streams my church sermons and previous sermons also. Do I need any written permission or any documentation to get approved for these streams?
You should not, if the organization that owns/submits the app is the church. My app does this. The pastor is the "account holder" for the app, and we had no trouble submitting, etc. Incidently, you may be able to get the $100 developer fee waived if you go through Apple's non-profit process. It's not a guarantee, but it's worth a try.