God's greatest gift to humanity is not merely the fact that God showed humanity the pathway to God, but also the fact that God Almighty ensured through Islam the right, the freedom and the liberty, for all human beings, both as individuals and as societies, that human beings require in order to choose God and follow the path shown by him.
Or not to do so, should they so choose, and follow a different path, which may be at variance with God's own chosen path.
I don't know who says what on this subject. But this is what the Qur'an has to say on the subject of choosing, or not choosing, God and his path:
Wa Hadayinaahun Najdayin.
"And we blazoned before him two different paths."