Italy certainly includes Christmas Trees in its Yuletide celebrations. However, in recent years ( maybe the new Pope has some bearing on this) there is a tendency to get them out of or tone them down- in actual churches.
Because it depends whether it is a vowel or a consonant. For example 'a apple' is wrong. 'an apple' is correct. 'a book' is correct. 'an book' is wrong. The word that begins with a vowel like orange,...