The same way many Atheists do it without the need for a God.
To believe in something, and have that be your focus doesn't imply that "Something" need be real . . . It only needs to FEEL real to them that believe it is.
We are the sum of our Genetics, Environment and Experiences. Given this is our foundation, some are born with a need to look outside themselves to feel complete because of "Poor Coping Skills":
"Why are there genes for addiction? We all have the genetic predisposition for addiction because there is an evolutionary advantage to that. When an animal eats a certain food that it likes, there is an advantage to associating pleasure with that food so that the animal will look for that food in the future. In other words the potential for addiction is hardwired into our brain. Everyone has eaten too much of their favorite food even though they knew it wasn't good for them.
Although everyone has the potential for addiction, some people are more predisposed to addiction than others. Some people drink alcoholically from the beginning. Other people start out as a moderate drinker and then become alcoholics later on. How does that happen?
Repeatedly abusing drugs or alcohol permanently rewires your brain. If you start out with a low genetic predisposition for addiction, you can still end up with an addiction. If you repeatedly abuse drugs or alcohol because of poor coping skills, then you'll permanently rewire your brain. Every time you abuse alcohol, you'll strengthen the wiring associated with drinking, and you'll chase that buzz even more. The more you chase the effect of alcohol, the greater your chance of eventually developing an addiction."
It is important to understand that one should decide the path that best suites them based on their overall mental disposition. It does no one any good to tell another person that thing they used to help them quit and addiction is a lie . . . it is simply what they need to help them achieve "Getting well". In the end this is what we all should want for each other.