My suggestions for your selling success...

Keep decorations to a minimum.  No matter your religious affiliation, it's best not to show it off to potential buyers, who may not share the same views.  If you have wrapped presents, consider putting them in a corner, away from view.  If you  must deck the halls, give in to your decorating urges with more neutral wintry pieces.

Consider pinecones or snowflakes instead of garlands and colored lights.

Finally, be sure your agent will be available during the holidays.  Discuss up front whether he or she will be in town, on call, or will have limited hours.

MERRY CHRISTMAS!  You now know my religious persuasion.  Personally speaking, 'phooey with the Happy Holidays'.