Existentialism --- God is causing me GRIEF!!

One opinion about our existence that I found very compelling was Kierkegaard's idea of existentialism. Existentialism is the philosophical doctrine stating tha our being as subjective individuals are more important than what we have in common objectively with all other human beings. Kierkegaard was especially concerned about his relationship to God. His doubts and fears concerned the validity of his very existence as an individual, longing to believe in God's promise. He didn't find peace in the abstract, impersonal logical relationships among diembodied forms. Because of this, he was very tortured and tormented about himself and his relationship with God. This doubt, and way of thinking was established by Kierkegaard as existentialism. Kirkegaard is acknowledged as the first existentialist philosopher. This idea of existentialism when faced with existence and God made me realize how little proof and connection we have with high powers when thinking about it existentially. I came to the conclusion that the answer to this existential problem can be answered by Descartes' logic, and is backed by rationalism. I think that even if you don't believe in god, you can still assume that a universe exists. This is because if there wasn't a universe, than you wouldn't be alive or exist yourself. According to Descartes, the only thing we can be one hundred percent sure of is our own existence. Therefore, you must know that a universe exists for you to exist in. This is a more rational, materialistic approach that I think Kirkegaard would doubt.