In other words, there's so much joy, love of family and praise to the Lord that God obviously approves these traditions to honor Him. Who cares about Nimrod, Ishtar, sun worshipers or Saturnalia when you've got Bing Crosby, Mom, apple pie and warm fuzzies. The reasoning is that God must feel good about Christmas and Easter because we feel good about them. We have fond memories, so God must have fond memories. The pagan origin of these days bears little significance to most people because there is no memory of paganism.
Pagan is a meaningless word, and nothing seems pagan today.
Whatever can be remotely called pagan is usually referred to as a quaint native custom, and people like to take pictures of it while they're on a tour. We need to expand our universe into His. Should she announce this to her grandfather who fought in the Pacific during WWII, she would probably come back to me and ask what a day of infamy meant. Her universe would expand a little bit into Grandpa's, and in deference to Grandpa's feelings we would choose a different day to honor the Japanese. The same might be said for a little Japanese girl from Hiroshima wanting to honor Americans on August 6th.