You should know that the duty to the Book of Allah (The Qur'an) entails practicing on its injunctions, be they commands or prohibitions, fearing its warnings, having hope in its promises, believing in its allegorical verses and taking admonition from its parables.
If you do this, you would have come out of the pitch darkness of ignorance towards the light of knowledge, and from the torment of doubts to the comfort of conviction. Allah jalllajalaaluhu says;