There is nothing in the Arizona Revised Statutes about firearms at religious institutions. However, it is prohibited to bring a firearm on "school grounds." Many churches have schools as well often just a kindergarten program or maybe the first couple of grades. Beware of that. I OCed at a school one time unknowingly where there was a Friday night meeting held in one of the classrooms. I never thought anything about it because I assumed that it was a church, not a school. The person in charge of the meeting politely asked me to leave the weapon in the car. He said he has no issues with firearms as he is a gun owner himself but due to the fact that the church also runs an elementary school, no guns are allowed. I think the chairman handled it well instead of flipping out, nobody else seemed to think it was an issue (no school in session), and I'm pretty sure that had a cop also attended the meeting I wouldn't have gotten in any trouble. The state law does include the word "knowingly." While I did bring a firearm on to school grounds, I did not do so knowingly. It was a good educational lesson because now I know to beware when entering places of worship because a lot of them are also schools. Just a heads up on that.