Will allah forgive a muslim who used to claim that he is allah or no? If thr muslim did a sincere repentance will allah forgive him??
Say, "O My servants who have transgressed against themselves [by sinning], do not despair of the mercy of Allah. Indeed, Allah forgives all sins.1 Indeed, it is He who is the Forgiving, the Merciful." [ Az:Zumar:53]
Allah will forgive any sin if he wills. Infact, it is haram for you to think that you have committed a sin that Allah will not forgive. Allah is Ar-Rahman Ar-Raheem Al-Ghafoor,
And Allah knows best