When I attended a big mega protestant church here in South Africa they eventually set up big security, they took up large offerings and they became a target for heights, a few times thugs came into the church after the offering and robbed the church and stole the money, once an usher was even killed, so when church starts they look the gates outside so nobody even late comers werent allowed to enter the parking lot, there were security guards outside, then inside the church they physically locked all the doors during the offering and nobody is allowed in or out and there were private security guards with mics in their ears at every door and also hidden security people inside the services keeping an eye on suspecious people during the services as we even had people who came into the church to steal peoples handbags when their eyes were closed while they were singing, we have a lot of crime here so we used to that kind of stuff, I was once in a church service when I was a kid and guys came there to steal cars and my uncle is an advanced driver and there was a marks men shooter who was armed at church so they took chase and folled the thieves and shot the tyres of the moving car and managed to get the car back. One time at another church guys came in there with guns and highjacked about 6 cars and had people laying on the floor with guns on their heads, my dads car was taken but we drove around the area and eventually recovered the car ourselves, we do our own police work here