Religion By Country (Most to Fewest Followers):
Albania: Islam, Unspecified, Roman Catholicism, Orthodox Christianity
Andorra: Roman Catholicism
Bosnia-Herzegovia: Islam, Orthodox Christianity, Roman Catholicism
Croatia: Roman Catholocism
Greece: Orthodox Christianity
Italy: Roman Catholicism, Atheism
Kosovo: Islam
Macedonia: Orthodox Christianity, Islam
Malta: Roman Catholicism
Montenegro: Orthodox Christianity, Islam
Portugal: Roman Catholicism, Unspecified, Atheism
San Marino: Roman Catholicism
Serbia: Orthodox Christianity
Slovenia: Roman Catholicism, Other, Atheism
Spain:Roman Catholicism, Other
Albania: Islam, Unspecified, Roman Catholicism, Orthodox Christianity
Andorra: Roman Catholicism
Bosnia-Herzegovia: Islam, Orthodox Christianity, Roman Catholicism
Croatia: Roman Catholocism
Greece: Orthodox Christianity
Italy: Roman Catholicism, Atheism
Kosovo: Islam
Macedonia: Orthodox Christianity, Islam
Malta: Roman Catholicism
Montenegro: Orthodox Christianity, Islam
Portugal: Roman Catholicism, Unspecified, Atheism
San Marino: Roman Catholicism
Serbia: Orthodox Christianity
Slovenia: Roman Catholicism, Other, Atheism
Spain:Roman Catholicism, Other