I was watching this video; a TED talk featuring Lezley Hazelton. She was using the evidence of Prophet Muhammad (PBUH) to prove an argument: "Doubt is essential to faith". Now, of course, she used the hadith where she was talking about how the prophet (pbuh) himself was so hesitant to the truth after encountering Gabriel in the cave and was relating it to doubt. I mean I understand that given any human being will be startled to non-belief after seeing something impossible happen right in front of their eyes.
I was watching another video by Dr Shabbir Ally, where he was talking about the certainty in faith. He was saying, how can't achieve absolute certainty in faith, cuz faith is all about trusting the unseen and that one can grow closer to certainty by clearing out doubts, reading books and learning more about Islam but never an absolute certainty like the prophets or the sahaba, cuz they witnessed miracles, therefore, the impossible and the unseen.
So how exactly do we define FAITH in Islam? Is Shabbir Ally right or wrong? Can we say Faith means to have certainty in Allah's existence or does it mean to believe in the certainty of Allah's existence.
After seeing both of this video, I am still kinda in confusion as to how we define faith in Islam. Cuz Allah in his holy book constantly talks about eradicating doubt and having to move towards being in a state of having no shadow of a doubt. Although it might be difficult, that's what this world is for; a test of faith.