It was authentically narrated that the Prophet said: When Pharaoh was drowning at sea, he was saying: {... I believe that there is no God but Him whom the Children of Israel believe in).} [Yunus 10:90] Angel Jibreel said to the Prophet: "O Muhammad, I was taking mud from the sea and throwing it in his mouth so that he would not reach the mercy of Allah (i.e. by saying: there is no god but Allah)." [Narrated by at-Tirmidhi]

Needles to say, such words uttered by the pharaoh indicate that he does not even try to know the name of God or anything about God. He never listened to the call of Prophet Moses. He was merely uttering these words in order to save himself from being drowned.