What is the ruling on one who is addicted to masturbation and is unable to marry or fast, and finds no way to stop this habit despite his commitment to praying in the mosque and attending lessons of knowledge? And is he considered weak in faith because of his inability to fast?

Continue to strive against yourself, for Allah guides those who strive, and do not despair, for every ailment has a cure. Treat your heart so it may strengthen to resist desires and doubts, and be mindful of Allah's watchful eye, remembering the reward of the patient. Read the book "Al-Daa' wa al-Dawaa'" (The Disease and the Cure) by Ibn al-Qayyim, associate with the righteous, acquire beneficial knowledge, and avoid isolation.