Treatment of intrusive doubts regarding the oneness of Allah?

The questioner : May Allah reward you. This person says: Honorable Shaykh, I am a young man who has suffered from a great problem, which is doubt in my religion, may Allah protect us from that, and the intrusive thoughts, the most dangerous of which is that I sometimes doubt the existence of the Creator and that this world came from nature only. I ask for your advice and guidance to remove these intrusive thoughts, and I ask that you not hold me accountable or be angry. May Allah grant you success.

The Shaykh : Look, this person is afraid. As for what the questioner mentioned, which is the doubt that Satan puts in his heart, this happened to the Companions, who were more sincere in their faith than us and stronger in their certainty, and they reported this to the Messenger of Allah (peace and blessings be upon him). He informed them that this is the essence of faith. He told them what? That this is the essence of faith. How was it the essence of faith? Because a person’s anxiety over these intrusive thoughts indicates the purity of his faith and that his faith is pure. But Satan tries to corrupt it with these intrusive thoughts. So what is the cure for this?
What is the cure for this if it happens? Its cure is with two words between which is the Messenger of Allah (peace and blessings be upon him): that one should seek refuge in Allah from the accursed Satan, and that one should stop. And even though he stops, he turns away from this. So we say to the one afflicted by it: Say, “I seek refuge in Allah from the accursed Satan,” and stop with your heart from these intrusive thoughts. Turn away from them; do not concern yourself with them, for they do not harm you. Even if someone asked you, you would speak with your tongue: Is Allah existent? You would say what? Yes. Even the one who has the intrusive thought. Even if someone said to you: Why do you pray? Why do you fast?
Why do you perform Hajj? Why do you perform 'Umrah? You would say: For Allah. So this doubt that comes upon certainty, which is confirmed by action, a person must not pay attention to it and must turn away from it completely. And when that happens, it will disappear, by the permission of Allah. So this is my advice to any man or woman who has something of that in his or her heart. What Satan puts in his heart will disappear, because he says that while believing in Allah and His Messenger, and being certain that the words of His Messenger (peace and blessings be upon him) are true. So let him seek refuge in Allah and let him stop. This is the truth, the cure, and the medicine. And there is no truth in these intrusive thoughts. Yes.