Not legal in some places. Don't know of any passage in the Bible forbidding weapons in the church... and I have heard of people breaking into cars at churches before. Gun's safer while on you than alone in the car.
As for being disrespectful, I don't see it thataway. God generally does the things that we can't do - turn water into wine, feed five thousand with a sack lunch, raise the dead, etc. The things that are within your power to accomplish are your problem. You shouldn't expect God to brush your teeth or cut your hair.
Extrapolating that into the preservation of your life is another matter, though. We can't do anything/much about certain diseases - Alzheimers and others. If cancer takes over and ruins your internals, God's probably the only one that can handle the matter.
I say God's given us the tools to protect ourselves from many threats to our lives: antibiotics, vaccines, vitamins, body armor, guns. They're all useful for certain situations - Amoxil will help you get through the flu, but it won't cure cancer. One vaccine will ensure that you don't get chicken pox, but you can still get a cavity - but the use of a toothbrush could prevent that. A gun can help protect you from a housebreaker or mugger, but it won't do any good if Curious George the Gangsta decides to just shoot you in the back of the head on the street for no reason.
