Is it considered a sin or an act of disbelief to depict a scene that mocks the concept of Christ healing the sick, while believing that God is the Healer and not Christ?

There is no harm in narrating this scene if it does not involve disparaging Jesus, peace be upon him, or denying his miracle. One must be careful not to insult disbelievers, as this may lead to them insulting Allah Almighty, for He says: "And do not insult those they invoke other than Allah, lest they insult Allah in enmity without knowledge."