Perhaps you should let the light of Christ into your life, and celebrate Christmas.
And all God’s people said: AMEN!
If these people are so much against Christmas, why do they feel the need to decorate at all? Why is "peace and harmony" recognized as a wintertime concept? If you attribute peace and harmoney to winter, what are the attributes of the other seasons, and what decorations are displayed for those?
The "no religious displays" idea is a cop-out. If you don't want to decorate because it's too costly, or takes too much time, don't decorate. But to decorate, and then give some concocted meaning to your effort so you don't "offend anyone" is nothing more than a cop-out.