I get what you are saying about not all christians are young earth creationists.
I do not agree which your insinuation the Politalkcer is not smart. I find this particular poster to be articulate and insightful.
Regarding your claim that only a "very small" percentage of christians are young earth creationists, I do not believe that assertion is backed up by actual data.
This recent credible poll indicates that 50 percent of Protestants and Evangelicals believe the Earth was created by God in the last ten thousand years, while that number is 37 percent among Catholics. I would not call those "very small" percentages.
Furthermore, the belief in a young earth increases with those who attend church regularly or on a weekly basis - up to 65%.
https://news.gallup.com/poll/210956/belief-creationist-view-humans-new-low.aspx