I am irritated by the cloak and dagger attitude you espouse here. There are plenty of ways to anonymously release the files. It does not take a great deal of competence with the Internet (particularly if you have someone helping you) to anonymously upload the sermons in question. I have no doubts I could do so.
I imagine it would be as simple as opening a proxy connection to the Internet hosted in a foreign country (perhaps double proxies to be safe), and uploading the sermons there to an agreeable website... Untraceable, unless perhaps you are the FBI or NSA...