If you "don't believe" then you are not a Muslim. You are what Allah called them (Munafqeen منافقين) because you choose what you like to do and leave what you don't like. My dear, Islam is not just saying the Shahada by your tongue and doing the five pillars like a robot and showing others (Riyaa'رياء). People like you have been around even when Prophet Muhammad Peace be upon him was alive. So don't consider yourself to be a special or new case. الله يهديج إن شاء الله