Americorp Real Estate
Brokers Associate, e-PRO
Off hand, I know of a beautiful church on Belden that is currently available.
Dave and Laura are both correct: loopnet and the MLS are fantastic resources. Commercial agents pay for premium access to listings not available on the free public sites. To get a more exhaustive look at what is available, an agent is the best option.
If you are in need of a commercial agent, we have some fantastic agents and brokers in my office. I would be happy to get you connected with one specializing in this type of lease.
Agents have access to that information. Many commercial properties including churches are listed in our MLS under "Institutions" or as David said below.... Loopnet is another commercial source used by agents.
Look at such limted free search tools:
loopnet.com - a commercial resource listing service.
mls.com (many will list commercial properties)