This all you need to know about "infidels":
"In the Islamic doctrinal sense, the term only refers to a person who does not recognize the one God (Allah) such as atheists and polytheists. However, since Islam considers Jews and Christians as fellow believers they are called "People of the Book (Ahl al-kitab)" instead."
Islam does NOT consider Christians NOR Jews to be infidels. "Infidels" applies to those who don't believe in any God.
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