Does Allah forgive all sins?

Do not lose hope in Allah's Mercy:

Indeed, Allah forgives every sin, for He is the Most Forgiving and the Most Merciful. Furthermore, in a Hadith Qudsi, God reassures believers, saying: "O son of Adam, as long as you invoke Me and seek My forgiveness, I will pardon you for your transgressions, and I will not be concerned about them."