Record a demo. A demo is a sampling of one or some of your best tracks. The demo should accurately reflect the style of music you play.
Post the demo online. A MySpace page or other free Web service can host the demo and band's information for free. This can act as a portal for booking gigs.
Network within your denomination. Contact other churches that are part of your denomination. It may be easier to get your foot in the door with other churches by sticking with your own faith first. For example, if you're part of a Methodist church, maybe you can network your way into other Methodist churches.
Contact youth leaders. Larger churches will likely have youth leaders. These are people in charge of the youth ministry. Contemporary music in church is normally geared toward youth, so youth leaders may set up concerts from time to time, and by contacting them, you may get opportunities to play at their church or participate in a concert.
Obtain a list of local churches. Your city should have a registry of all the churches, and there are a number of online directories that list churches as well.
Contact the churches via email first. Explain that you would like to play at the church. Include a link to your website, so the churches can hear your music. Make sure the email is polite, professional and short.
Wait for a response. If the church not responded in a few days, call. Explain to the church secretary that you sent an email about playing at the church and would like to follow up with the right person. Churches will have different people in charge of booking a band, so there is no one person or position in every church who is in charge. However, this is usually the worship leader.
Schedule a time to come and play. Suggest your band's services at other events, such as church picnics or fund-raisers.