If he were to say "We had to explain to the usher that we don't allow guns in the sanctuary" or, "After that, the church adopted a rule to prohibit guns from our buildings."TrueFlog wrote: lest he should accidentally give me oral notice!
neither are oral notice to you, as he was talking anecdotal, not informing you, at least that is how I would have taken it.
Remember that "adopting a rule......." is not notice, unless he verbally stated that "you are not allowed to carry here", unless they actually had the 30.06 wording in a manual that you were required to read, much like an employee has to have at work where it is not allowed, or they have to post the fully official 30.06 sign, in size, contract, and languages.