On eternal plane Deen of Allah is entirely secular and scientific.
On earthly plane man has divided the secular and religious without eliminating the falsehood in both the secular and religious that make them separate and exclusive.
The millat of Ibrahim intersects the secular and religious by discarding the falsehood within and between them.
Hence, there are many religious teachings of Tawhid (unity and universality) in Islam. These include the teachings of the unity of God, unity in the teachings of all the Books and Prophets of God, unity between Word of God and the sayings and doings of the Prophets and so on.
Therefore, Islam is not entirely devoid of religion.