I have heard of Marduk being a lot of things...from Sitchin's ideas of an Alien God, to possibly being Michael the archangel.
I have never heard of Marduk being Santa Clause though.
I do know there was a Saint Nicholas........I also believe there was origins in Christmas with Amantia muscaria mushrooms :
Here are some facts from (
http://www.iamshaman.com/amanita/truemeaning.htm)
1. Saint Nicholas is the Patron Saint of Children (in Siberia)
2. The Reindeer Eat The Mushrooms.. Hence the Flight.
3. The Mushrooms Grow under Pine Trees in nature (nearly Exclusively)
4. The Mushrooms are Red and White.
5. The Mushrooms Were Typically Dried by Hanging them on the Hearth of The Fireplaces on Strings. Stocking Stuffers anyone??
6. They are Gathered in Sacks.. Santa's Bag.
7. The Very Name Christmas.. Is A Holiday Composing of the Words
...Christ (meaning the Anointed with the Magical Substance)
...Mass (a Special Service of the Sacramental ingestion of the Eucharist) the Body of Christ. In the Catholic Tradition this Substance Has been replaced by the Doctrine of Trans-substantiation, Whereby (By magical Ceremony) The Priests Claim the Ability to Transform A Cracker into the Literal Body of Christ.. Placebo!!
This is also very interesting:
Christmas Observations
by Anonymous of
www.entheology.org
Christmas today is the best conglomeration of things that turn of the century New York retailers could put together, and its resemblance to anything before that time was purely for their convenience. For example, Rudolph the Red-Nosed Reindeer was invented by a department store to boost sales. His red nose is unlikely to have any relationship to Amanita.
Tree worship has enormous and wide-ranging pagan background quite independent of mushroom proximity. One anthropologist proposed that our habit of decorating trees with lights (only recently indoors) can be traced all the way back to ceremonies originating with Man's learning to use fire.
The fact that Santa's suit is red and white actually has a startlingly modern origin: Coca-cola commissioned an advertisement, with Santa wearing their colors, in 1931 to try to boost their child market. (It was illegal for them to show children actually drinking Coke in advertisements, since Coca-cola originally contained coca, but that's another story) In the 19th century, "Father Christmas" was usually considered to wear greenish "forest" colors. Red was increasingly a popular Santa color in the early 20th century, but red and white together was due to Coca-cola's advertisements.
"Saint" Nicholas was considered the "patron saint" of many things, including sailors, merchants, and children - but "he" wasn't from Siberia. Actually, "Saint" Nicholas was most likely a combination of two historical characters, one of which was from Asia Minor (Turkey). Recently, the Catholic Church announced that there was never any official "Saint Nicholas", attributing the character to pagan sources. Claiming the Eucharist is built around mushrooms is without justification, thus breaking the word "Christmas" down for us is not too meaningful.
However, many religious traditions do have origins clearly linked to entheogens, which did get replaced with a "symbolic" ceremonial placebo.