Yes, it seems hopeless to "convert" those lost souls of metaphysics and stupidstition. But if they are here, they are looking for more answers.
What can be done is continuing the push for rational education through science. If we can show children how each myth, one by one, has been debunked by science and reason, it is possible they will reach an inevitable conclusion that all myth could be explained in time. This is up to the proper teaching of the scientific method and critical thinking skills. And us. Here.