What prevents me from…
· Smoking cigarettes?
· Doing drugs?
·Becoming a drunkard?
· Cheating on my spouse?
· Bad work ethic?
· Gambling?
·Being dishonest?
I imagine the awareness of the harm it would do to you or others is what stops you. What makes you think that without god there are no morals? I believe that when you are convinced there is no god, you actually spend more time thinking about right and wrong, and do more to avoid harming others. At least that's my experience.