See, that comes across as so weird to me as a European. It's not that churches, cathedrals and/or monasteries here on the old continent don't have security, they do, but actual security guards is mostly limited to the ones that are tourist spots and/or contain historically important artefacts and art, and they're more there to stop vandalism and theft. Your bog standard local church tho has more passive security, like cameras and alarms, at best. There's one on the corner of my street, used by an evangelical congregation, and I'd be surprised if that has security more stringent than a lock on the door.