Universal mission, finality, continuing evidence and preserved teachings are four distinct aspects of the Prophet’s message.
Universality makes his invitation applicable to all; finality excludes a new prophet after him; the continuing Qur’an preserves the proof of his truth; and the availability of his teachings keeps the way of following him open.
Following Islam therefore means more than accepting past history. It means adopting the Prophet’s continuing guidance. The declaration إِنَّ الدِّينَ عِنْدَ اللَّهِ الْإِسْلَامُ is understood in this setting.