The "Partridge in a pear tree" was Christ.
2 Turtle Doves = The Old and New Testaments
3 French Hens = Faith, Hope and Charity-- the Theological Virtues
4 Calling Birds = the Four Gospels and/or the Four Evangelists
5 Golden Rings = The first Five Books of the Old Testament, the "Pentateuch", which relays the history of man's fall from grace.
6 Geese A-laying = the six days of Creation
7 Swans A-swimming = the seven gifts of the Holy Spirit, the seven sacraments
8 Maids A-milking = the eight beatitudes
9 Ladies Dancing = the nine Fruits of the Holy Spirit
10 Lords A-leaping = the ten commandments
11 Pipers Piping = the eleven faithful apostles
12 Drummers Drumming = the twelve points of doctrine in the Apostle's Creed
The abbreviation of Xmas for Christmas is not irreligious. The first letter of the word Christ in Greek is chi, which is identical to our X. Xmas was originally an ecclesiastical abbreviation that was used in tables and charts.
The actual gift givers are different in various countries:
England: Father Christmas
France: Pere Noel (Father Christmas)
Germany: Christkind (angelic messenger from Jesus) She is a beautiful fair haired girl with a shining crown of candles.
Holland: St Nicholas.
Italy: La Befana (a kindly old witch)
Spain and South America: The Three Kings
Russia: In some parts - Babouschka (a grandmotherly figure) in other parts it is Grandfather Frost.
Scandinavia: a variety of Christmas gnomes. One is called Julenisse.
The Christmas season begins at sundown on 24th December and lasts through sundown on 5th January. For that reason, this season is also known as the Twelve Days of Christmas.