As a non-Christian, I never made that Xmas connection.
Well, as a Christian, I wouldn't feel bad about it because the poster is not correct. The X in Xmas does not stand for a cross, it comes from the Greek spelling of Christ which is Χριστός. The chi-rho symbol (☧) is an imposition of the first two letters (Χ and ρ) and is still commonly used to refer to Christ in some denominations.
As a bonus: if you've ever wondered (or not wondered) why some Christian symbolism uses a fish, ἸΧΘΥΣ (or ICTHYS) is an acronym for Ἰησοῦς Χρῑστός Θεοῦ Υἱός Σωτήρ, "which translates into English as 'Jesus Christ, God's Son, Savior'." (https://en.wikipedia.org/wiki/Ichthys) This has been used since the first century.
Dukat. I don't like him a person, but he's a great character. No other Trek character has ever been written as richly or layeredly as he.
At first you assume he's your basic racist bent on hatred and power. Then you realize his obsession with Kira isn't just about destroying an enemy, but his secret love-hate for Bajoran women. We meet Ziyal whom he mostly loves, but is ashamed of. He goes mad, starts a cult, makes himself appear Bajoran and starts a relationship with Kai Winn (ostensibly with other motives, but I think he reveled in it), and ultimately dies for and in his mad faith.
DS9 is lower on my list when I rank the various series, but some of the characters, and defininitely Dukat, top the list of characters.