Allah
"Indeed, I am Allah; there is no god except Me, so worship Me" (Qur'an 20:14) — creatorship claimed in the first person, repeated from the text's first chapter to its last.
The voice of the text itself — not raised on His behalf by later councils — in a text whose preservation can itself be examined.
The self-description answers, point by point, what reason established: "He is the First and the Last" (57:3), "Allah, the Eternal Refuge; He neither begets nor is born" (112:2–3), "He knows what is before them and what is behind them" (2:255), "over all things competent" (2:20), "Say: He is Allah, One" (112:1).
The one candidate on file whose claim survives the test: every attribute the uncaused origin must have is claimed in His own words, and none is contradicted by the record. Where every other candidacy fails an attribute, this one stands on all six.
SOURCES · Qur'an 20:14 · 57:3 · 112:1–3 · 2:255 · 2:20
Didn't He Say