Sister, how can you misunderstand so much clear and valid proof? It does apply to all the celebrations, religious or not, scholars clearly state that. What it doesn't apply to is the things that they do and invent from which we may benefit. Seek refuge in Allah, there is no contradiction in any of it.
"Another example is their imitation of the festivals of shirk and bid’ah, such as birthday celebrations, whether it is the birthday of the Prophet (peace and blessings of Allaah be upon him) or the birthdays of presidents and kings. Or these festivals of bid’ah and shirk may be named after days or weeks, such as a country’s national day or independence day, or Mother’s Day, or hygiene week, and other days or weeks that are celebrated. All of these have come to the Muslims from the kuffaar, for Islam has only two festivals: Eid al-Fitr and Eid al-Adha. Anything else is bid’ah and an imitation of the kuffaar. From a khutbah entitled al-Hathth ‘ala Mukhaalafat al-Kuffaar (Exhortation to be distinct from the kuffaar) "
I am not here to debate you, argue you, or prove myself right in any way, shape or form. I am informing you of the clear and abundant evidence. It is clear to me, and if it is not to you, I advise you, as a sister, to seek the answer by other means which you are comfortable with. No Muslim scholar has deemed Thanksgiving, or any other kuffar holiday religious or not, permissible to celebrate. Allah knows best and He is the best Judge in all matters.
Fi aman Allah, may Allah protect you.