Zoroastrianism has a strong effect on modern Judaism and Christianity
and Islam.Heaven ,Hell,angels,Satan,duality between God and Devil,...
are all Original Zoroastrian concepts.It happened when cyrus freed the
Jews and ordered them to return to Israel.He probably was planning to attack
Egypt,and wanted a Jewish stronghold on the way.So,this combination
is mother of Christianity and Islam both.As to me these two "religion"are
born because of Achaemenid intelligentsia's plan.