I got an email the other day where a woman asked me if she had to force herself to believe in magic in order for it to work. The answer is no. You do not have to believe in magic in order to achieve success. However, you do have to be open to the possibility. With me, belief has nothing to do with it. If I need something done I do it. I don't stop to question if I believe it will work.
Now, one of the most common things you will hear outsiders or non-practitioners say is that if they don't believe in it then it won't effect them. They are talking about curses and enemy work. Of course this is a load of b.s. and is not true. However, let them think what the want to think. So for example if you have to do enemy work on a person all that matters is that you, the worker, are open to it. It doesn't matter one bit if the target doesn't believe in it. So let the target think what they want. Their life will go to crap and they will still disbelieve. They will come up with all kinds of rationalizations. Let them.
So you don't have to believe in magic, just be open to the possibility. If you disbelieve then your chance at success will be slim to none. Because if you disbelieve in it you are going to get what you want, which is nothing and failure.
For most people they enter into a magical tradition or practice being open-minded. If they experience success then they might become true believers. Those who do not experience success usually quickly drop out and become disbelievers. It's just that belief itself is not necessary for producing effective work.
They way I look at it is like this. Most people will say they don't believe in magic. However, such people are betrayed by their actions and responses. Don't believe me? Ask someone if they believe in magic. If they say they do not then ask them if you can have a snip of their hair. LOL Belief is not required.