Questions for the Late Holidays

Have you noticed that people who avoid saying “Merry Christmas” and say “Happy Holidays” instead, explaining that they want to include all seasonal holidays continue saying “Happy Holidays” after Hanukkah ends, but stop saying “Happy Holidays” after Christmas, even though Kwanzaa starts after Christmas and New Years’ Eve/Day and Epiphany are yet to come?

How secular, really, is it to say “Happy Holy Days,” anyway?

Also, what is the adjective to apply to celebrations of the Epiphany? “Happy Epiphany”? “Merry Epiphany”? If we as a people have not yet set one, I should like to wish everyone a “Personal Epiphany.”