How does one get rid of obsessive thoughts that plague them concerning creed and the Divine Essence, and that affect their life, despite their commitment to acts of worship, remembrances (adhkar), and ruqyah shar'iyah?

The penitent must be sincere in repentance and abandon all sins. He must make up for the days he intentionally broke his fast in Ramadan and for the prayers he intentionally missed. The treatment for obsessive thoughts is to ignore and turn away from them. He may consult a trustworthy psychiatrist. He should also increase in supplication and remembrance of Allah Almighty, entrust all affairs to Him, and have a good opinion of Him.