According to Buddhist doctrine , the original Buddha no longer exists.
When one attains Buddahood , after one's particular state of incarnation ends , the next state is non-existence. Ergo , he no longer exists.
What you can do is learn about his teachings. This is as close as being a "follower of Buddha" as you can get.
In Buddhism , I don't think anything is said about magic and witches. If anything was said about it , I cannot recall it.
It should be noted that Magic is much like a tool and Buddhism advocates the letting go of unnecessary desires and baser feelings such as anger.
Thus , as a result , things like curses and the likes are thus naturally inappropriate.