Okay, now I think I understand.  I thought you were just referring to the city’s real property taxes and related exemption.

At the federal and state levels, churches and other charitable (501(c)(3)) organizations do not pay income taxes on their charitable activities.  In exchange for this, they are heavily regulated.  There are, however, organizations that skirt the edges or don’t follow the law.  In general, I would say that all of our tax systems should be reviewed.