God revealed his plan to Noah, but no where in the Bible does it say that God asked Noah to warn the people about the coming flood nor does it appear therein that Noah ever attempted to do so on his own. He just built the boat, got the designated animals and his family on board. And God shut the door. Then the rains fell.
Al-Salam Alaykum,
Well then, the prophethood of Hud(puh) is a disagreement between our religions. Because in Islam he is a prophet. As stated in a surah named after him:
Bismillahir-Rahmanir-Raheem
Surah Hud [11:25]
And we had certainly sent Noah to his people,[saying] "Indeed, I am to you a clear warner".
If in the christian bible it did'nt say that he did works of a prophet, then this would be a disagreement between our religion, imho.
And Allah, subhana wa taala, know best.
Salam!