Re: I could use some ideas.
Sounds like your ideas are working just fine all on their own.
If you want to go that route, to expand and get bigger, copyright the name "Christian Battle of the Bands" or whatever name you actually decide to name it, and retain an agent.
If you get five hundred this year, and everybody enjoys it and brings a friend next year, and so on, you will be talking about a big venue in a couple of years. I don't need to tell you that there's a big market for Christian music. Good luck and God bless!