I'm a member of SMART but I also got some out of NA. However, my "Home Group" was actually an AA meeting. However, I would state "I am an alcoholic" instead, because I know that even though I've only been drunk once, if I touch the stuff I'll be as addicted as I am to my drug of choice. I liked this meetings simply because I could relate to the people there a lot better.
I know many NA peeps who do not consider God their Higher Power. Some believe it is the NA program that is larger than themselves. Please don't let that scare you away.
Everyone is different, and although NA did not work for me does not mean it won't work for you. I know many people it has saved from a death due to drug abuse.