لِأَنَّ الإِسْلَامَ هُوَ الْخُضُوعُ وَالِانْقِيَادُ
Islam means humble submission and compliance.
Khudūʿ denotes humble yielding, whereas inqiyād emphasizes acceptance and obedience. Physical conformity alone does not necessarily establish religious submission in the full inward sense; genuine compliance presupposes accepting God's authority.
Someone may perform the outward movements of prayer to impress others, while the heart rejects belief. Conversely, sincere assent is not permission to neglect religious obligations. The outward and inward dimensions have distinct roles even when genuine faith and submission are inseparable.