Can jinn possess a human, and if so, how do they control him and lead him to actions he does not desire? And how will Allah hold accountable a person who lived possessed by jinn, without knowing anything about his condition, especially with Allah Almighty's saying: "And that Allah is never unjust to His servants"?

A jinn's possession of a human may be an act of revenge by the jinn for harm inflicted upon it by the human. A madman is not held accountable, as the Prophet, peace and blessings be upon him, said: "The pen has been lifted from three: from the sleeper until he awakens, from the child until he reaches puberty, and from the madman until he regains his sanity." Accountability is based on intellect and capability, and one who lacks intellect is not capable, and Allah wrongs no one.