Religion had nothing to do with it.
Religious wars arose many centures later between the followers of Yahweh/Jehovah/Allah who insisted that they alone were right, and fought to impose their views on others/each other. Before that, people generally recognised the gods of different peoples as being the same, but with a different local name eg Zeus = Jupiter.
The Persian War was not about religion. Religious wars arose with the rise of the exclusivist religions which came out of the god Yahweh (Judaism, Christianity, Islam).
No Muslims are people who follow the religion of Islam and Persian is not an religion its a ethnic group.
Yes, particularly the Persian Gulf War.
there was the first Persian war then the second Persian war then the war that we are in today.
The main religion in Persia (Iran) is Islam. It is a monotheistic religion. Many people use the term "Persian Religion" to refer to Zoroastrianism, which is the historic Persian religion. Zoroastrianism is a monolatrous form of henotheism. It does not fit into the binary of monotheism/polytheism.
Persian Americans can have any religion. Typically, they are either Islamic because of their Persian background or they are Christian because of America but they can also be Atheists, Pagans, Hindus, Buddhists or any other religion.
The Persian War.
Currently, most Persians (or Iranians) are Muslim.
Which particular war? The Persian what?
Islam.
zoroastian
Persian War 499-449 BCE. Peloponnesian War 431-404 BCE.