Yes, Shadowdancer.
If you believe that there are absolute moral standards; that there is absolute truth; that Someone is watching you; that there is ultimately perfect justice; that there is a penalty to pay for disobeying God's law -
yes, it affects your behavior. For instance, some day you'll answer for your use of profanity. Mock if you will. You will answer for it.
Myself, I don't use profanity. Because God says not to, and I know He hears what I say. See? My belief system just affected my behavior.
I'm not worried about it. God likes me better than you.