what happen if numenor didnt rebel against the valar?

[Zigûr]

Originally Posted by tom the eldest

if ar-pharazon resist sauron and banish him to mordor,sauron could rebuild his troops in secrets,since the king will thought that sauron is defeated,he will not shows up anymore,while in reality sauron device another plan to weaken the numenorean.probably a surprise attack to umbar,and sauron impose much scarier image to his men,the former should take the numenorean by surprise,and the latter will make sauron army much more fearful to sauron thean to the numenorian.but the numenorian had ally.gil-galad and durin the third is still in middle earth,and they would prove to be hard to defeat.

If Sauron was incapable of defeating the Númenóreans on their own when they had become so strong under Ar-Pharazôn, he certainly would have been if they had allies.
The whole reason Ar-Pharazôn captured Sauron in the first place though was because he wanted to eliminate him as a rival for world domination, so why would he send Sauron back to Mordor where he could easily rebuild his power? Wouldn't that put everything back where it started?
Maybe a faithful Pharazôn could have somehow restored communication with the Elves and in doing so arranged for Sauron to be transported to Aman to face the judgement of Manwë - now that's an interesting idea if I do say so myself. But I don't think Sauron would have permitted himself to be captured by faithful Númenóreans. Going to fallen Númenor was safe. If they'd still been allies of the Elves and the Valar I imagine he would never have come to Umbar and submitted. In that scenario the Valar would have had to deal with the Ring, though, and whether even one of the Powers could bring themselves to have it unmade.

Originally Posted by tom the eldest

now,if this happen,then gil-galad wont be dead,no gollum,no iron hills or erebor,and the noldor would be still a very srong kingdom,unlike the waning elven sanctuary in the third age.

We don't know for sure that Gil-galad would survive a war. Also, why "no Iron Hills or Erebor"? This wouldn't stop the Dwarves uncovering the Balrog in the Third Age as they continued to mine for mithril.
Also I think no matter their amount of their success the Noldor would have waned in the Third Age because it was not in their nature to stay in Middle-earth. They would have faded in any event.