If you trace the origins of the major holidays like Christmas, Easter, Thanksgiving...you will many of the traditions were pagan in origin and adopted by the Christians in the attempt to convert them.
So by picking and choosing the aspects I celebrate, I feel I' m doing no more than many have already did.
I celebrate Christmas as a time of giving, Thanksgiving because I am thankful for all that I have, Easter as the coming of Spring.
...and I'll have to agree with MLA on the issue of morals...I do things because they are the right thing to do, the hardest judgement for me comes from within.