Where have i claimed to be pure? I just stated the facts. No one can be agnostic and muslim not just Hassan but no one. It's a fact. You can't have imaan if you doubt Allah am i wrong?
You actually can, even from a Qur'anic perspective.
Ibrahim, for example, on many occasion asked for proof from God to help his heart to become content with his faith. Ibrahim went as far as considering a distant star to be his lord (or a planet - Allah isn't too clear on which one the word
kawkab refers to). Then he called the moon his lord, then the sun.
Ibrahim then decided to turn his face towards whatever it was that created those things, while still demanding to see God's work of raising the dead in action. All of these are manifestations of doubt. While God satisfied Ibrahim's requests, he doesn't seem to work that way for us anymore.
Musa, as well, demanded to see Allah. This also presents a manifestation of doubt.
Muhammad was so unsure of his prophetic mission that he contemplated and even went on to attempt suicide. The Qur'an speaks of this lingering desire to commit suicide even later in his career.
"Fa la'alaka baakhi'un nafsaka 'alaa athaarim in lam yu'minu bihathal haddethi asafa. - "It may be that you, Muhammad, would kill yourself over their trails in sorrow, if they don't believe in this speech." Suicide is considered a form of kufr, and yet the Qur'an confirms that it weighed heavily on the prophet's mind.
Struggling and wrestling with the idea of God is actually a common trend among many religious figures. Agnosticism speaks to an absence of knowability, not necessarily an absence of faith. Being so sure that you know exactly what and how God
is presents a form of arrogance. If there is a God, then it is from the affairs of the unseen and unknowable. That is the spirit behind agnosticism.
"Wa maa kaan Allahu Li yut'li'akum 'ala l-ghaib." - "It is not God's will to give you insight into the secrets of the unseen." (Surah Al- Imran.)
So yes, you can be an agnostic and a Muslim, as Hassan has clearly stated that he is a Muslim, but that he does not claim to have knowledge of those affairs which are beyond human perception.