The megachurches often employ a bunch of off-duty officers on Sundays to direct traffic and handle internal security. This is expensive. Most megachurches are also plagued with oddball "hangers-on" who are looking for cash assistance, food, or just attention. They need to be dealt with "discreetly", as they scare off parishioners. I know one large church whose leader always has an armed bodyguard at a discreet distance.
This is likely the motivation for the request for quasi-official status.