So shana took a strong determination . She said in her mind-

 I will take a deep study about the running religions in human society. But She saw that a majority parsent of the religions has gone away from the sight of  modern civilized world because of their own disqualification.

Most of them were the archive of ignorance and illogical blind faiths. that's why they  vanished and remained  nothing eccept their meaningless ceremony of worships.
So it's not necessary to study about these dead religions.

Only few, three or four religions are granted and followed by modern humans. So Shana will discover...