Why do Muslims call us infidels?
All the people who don't believe what you do are infidels
(unbelievers) from your perspective. To Christians, Muslims are the
infidels.
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Christians and Jews call Muslims infidels. However, Muslims call
Christians and Jews as "people of the book" as they are holders of
the holy books Torah and the Bible that Muslims believe that these
holy books are revelations of God.