How Were Islam and Zoroastrianism related?

How did Islam draw from Zoroastrianism?

all those religions are based off of the old testament, they differ on points after the old testament.

Zoroastrianism was present in the Arab region prior to the creation of Islam. It had its influence by simply being there, just as Christianity has influenced common law in the United States. ZOROASTRIANISM WAS NOT BASED ON THE OLD TESTAMENT. THE RELIGION EXISTED BEFORE THE BIBLE WAS WRITTEN.

Check out this website: The Pagan Religious Sources of Islam -

http://www.answering-islam.org/Silas/pagansources.htm