فَإِنْكَارُ الْعِلْمِ الْمَوْجُودِ كُفْرٌ
Rejecting the knowledge made available to creation is unbelief.
Once a truth has been conveyed by Allah, it must be accepted. Faith does not depend on the servant independently grasping every detail of the divine report; rather, he acknowledges the truth of what Allah has disclosed. Denying that disclosed knowledge contradicts such acceptance.