By default, the US government considers churches to be 501(c)(3) organizations automatically, simply by virtue of existing. That is true regardless of corporate structure or lack thereof.Unless you don't file 501 status. Churches don't need to file 501 to be tax free.
For that reason alone, a church (generally) is a 501(c)(3).
Does a Church Need 501(c)(3) Status? A Guide to IRS Rules
Does a church 501(c)(3) status? Read this article to learn the basics of 501(c)(3) churches, including the history of nonprofits and myths about churches.
www.501c3.org