also it can be said that these 3 religions have same roots, they are abrahamic.
just as an example, everyone knows as that jewish star is only using by jews but in ottoman art, you can see that star so often. because of it's a magic sign on a ring who sent to king suleyman (salomon) by the angel Jabrail (gabrial). with that ring, suleyman could rule to winds and animals..
there are common stories and common propets in that holy books. you can see similar things on ancient greek or sumerian myths too..
i can give "the flood" as an example for it. till the begining of this century, people used to know that the flood has been told in jewish bible as first time. till they have found an ancient clay tablet from sumerians. this tablet belongs to last part of the myth gilgamesh.
in that tablet, there is telling a king named ziasudra.
one day, the kind of wisdom, enlil decided to end the human race and he has planned to apply a great flood. but another god, enki, the creator of humans, doesn't want it and tell to king of shurruppak ziasudra to make a great ark and put pairs from animals and human. enki tells it with his shadow just like in bible.
ziasudra makes that ark. and the flood accours..
it takes 6 days! after that 6 days, the ark coasts to mountain eratta (ararat in bible and agri in turkish). because of that flood, sumerians was memorizing that day in each 6th day of weeks. 6th means "subati" in sumerian. and it's the saturday.
after them, jews used that day as "shabbat" and it's "friday" for muslems..
