So uhm exactly why are you putting up a Christmas tree?
As near as the consensus of the thread can tell, there is no reason. It's just tradition symbolizing nothing. It's up to you to have a reason if you are rational, not us. Santa Claus told me to do it so I can get presents if I worship under the tree is not a reason.
And for the support of this Declaration, with a firm reliance on the protection of Divine Providence, we mutually pledge to each other our lives, our fortunes and our sacred honor.