it is same as god planned in bible/koran.its not wrong.incest between father and daughter or brotehre and sister is ok as per many holy books.
as per bible/koran and even manuwadi books,some deity god/allah created 1 couple who had kids [ brotehrs and sisters ] theyse brotehrs and sisters procreated and did incest and we r their incesteous children.
this is as per religious books,this is not truth.
so religion basically sanctions incest as u can know from many religious booksw,hich claim man is created not evolved.