I read a hadith (that's sahih) that says the majority of people in hell are woman. Is that true?
According to the scholar Qadi Iyad, “women are the majority of humanity” (not sure how he concluded this), so that they make up the majority in both Hell and Paradise.
There is another hadith narration in which the Prophet (pbuh) says that he looked into heaven and saw that the least of its inhabitants were women. Ibn Hajar says that it is likely that one of the narrators of this hadith had heard the other narration that the majority of those in Hell are women, so they messed up this one so that it says less women would be in Paradise, mistakenly thinking that if there are more women in Hell, there would be fewer in Paradise.
There is nothing in the Quran to suggest that women are less virtuous than men or that they are more likely to enter Hell, so this is the unshakable foundation upon which our beliefs are based.