Vatican City: Spiritual center of Catholicism, home to the Pope, with no Muslim population.
Tuvalu: Remote Pacific island nation, predominantly Christian, with no recorded Muslim residents.
Nauru: Small island country in Micronesia, predominantly Christian, with no Muslim inhabitants.
San Marino: Enclave in Italy, predominantly Catholic, with no Muslim population.
Monaco: Wealthy Mediterranean principality, predominantly Christian, with no Muslim residents.
Palau: Pacific island nation, predominantly Christian, with no recorded Muslim population.
Marshall Islands: Pacific island country, predominantly Christian, with no Muslim inhabitants.
Liechtenstein: Small European principality, predominantly Christian, with no Muslim residents.
Kiribati: Central Pacific island nation, predominantly Christian, with no Muslim population.