Re: intermarrying? incest?
haven’t you heard about the last Khutba in which the prophet [saws] said that “be witness that today i’ve completed the deen for you”…which means nothing can be added or deleted or amended in the major issues. marrying a sibling is a major issue. the door to ijtihaad is closed on that.
the prohibition of alcohol was introduced in stages as a ‘need of the hour’…later it was declared Haraam through the aHaadees e saHeeHa. that’s just one example.
Adam WAS the first man on earth as accepted by ALL the monotheistic faiths.