What is the ruling on uttering the Shahada with the intention of entering Islam if a person has committed an act or uttered a statement that constitutes disbelief (kufr) or if their disbelief is doubtful? And does that affect their Islam? And is it necessary to be certain of the disbelief of the act for the Shahada to be valid? And what is the ruling on uttering the Shahada without the intention of entering Islam with the heart?

Do not pay attention to whispers (waswas), their only cure is to ignore them and turn away from them. He whose Islam is established does not depart from it except with certainty. If you doubt whether a statement or action necessitates apostasy, then dismiss this doubt, especially if you are prone to whispers. Uttering the two testimonies of faith (Shahadatayn) is a good deed for which its doer is rewarded. Your belief that one exits the fold of Islam due to your intention to embrace Islam is a whisper that must be struggled against.