Is it permissible to eat from the sacrifice of a person who repented from insulting the Divine Being, but it is highly probable that he did not truly repent?

Reviling Allah the Almighty is an act of disbelief that expels one from the fold of Islam. If a person repents with sincere repentance that fulfills its conditions, then Allah the Almighty accepts his repentance, according to the majority of scholars, due to His saying: "Say, 'O My servants who have transgressed against themselves [by sinning], do not despair of the mercy of Allah. Indeed, Allah forgives all sins. Indeed, it is He who is the Forgiving, the Merciful.'"