Is a person afflicted with obsessive-compulsive disorder regarding creed and the existence of God, who feels a loss of faith despite performing prayers and supplications, considered an infidel or one of the people of Hellfire?

You must stay away from the whispers of doubt concerning the existence of God, for God is too magnificent for minds to doubt Him. The proofs of His existence are evident in the precise creation of the universe and man with his miraculous composition, as the Quranic verses indicate: "And in yourselves. Then will you not see?" and "Or were they created by nothing, or were they the creators?" Man's innate nature perceives the existence of the Creator, and the Messengers confirmed this by saying: "Is there any doubt concerning Allah, the Originator of the heavens and the earth?" Your fear of Hellfire is a sign of your faith, so there is no need to worry; seek refuge with Allah from Satan.