Re: why woman is not allowed to become Imam (leader)
Since we do not have the list of all 124,000 prophets therefore we do not know how many of them were women.
That being said. As to the question of woman not being Imam
Here is perspective of those who are in favor:
women as imam
And this is the perspective of those who are against it.
Can a Woman Act as Imam or Deliver Jum`ah Khutbah? - IslamonLine.net - Ask The Scholar
Now you be the judge.