If your not a medic or it isn't an ALS agency, you can only do BLS.
You can't carry backboards so you can't do that until a rig or some other vehicle brings you one.
What else would you do that is so special?
I work for an IFT company in NY. We have the same protocols as the 911 units. We transport. With the shooter's location and identity being unknown, we are not sticking around and we aren't leaving the patient there.
Don't think it's a problem. If you want to work as an EMT, just do it. I'm Jewish and have zero problems with it. Have had Muslim partners. No problems.