The problem with church security teams is a typical one: give someone a hammer and every problem looks like a nail. Right before I retired, my pastor approached me with thoughts on church security. I gave the elders a few simple things they could do to improve the buildings security and harden the area. (none of which involved firearms) None of these things would be intrusive and it would all be free and of course, none of it has been done. I also advised my pastor that he should run those thoughts by the churches governing body, since we're talking about increased liability for the church, as well as insurance issues. It isn't as simple as picking a few friends of Jesus to pack heat. So far, I haven't been approached again and I'm relieved. Every Sunday, I sit in the back at the end of a pew, where I can observed the entrance and exits and keep a visual on the hallways. I'm satisfied with that.
Just to play devil's advocate, (see what I did there?) could your own attitude be a roadblock to the teams receptiveness? Please understand, I'm not trying to be rude, but your level of training and experience isn't extensive either. You don't know what you don't know. Is it possible that you're coming off like a timmie tactical know it all? Just something to think about.