You realize that your reasoning is illogical, don’t you? Most Christians are “old earth”, but the earth age issue is peripheral (although evolution isn’t). The math of macro-evolution is absolutely hopeless. People cling to Darwin because it is their “creation story”.
BTW, someone who says that you have to have a specific view of the age of the earth to be a Christian is quite literally a heretic.
I don't think I quite said that. The way I usually hear it (including many times on FR) is that the Bible says the universe and all the life in it was created in a certain number of days. And if we choose not to believe that, there is no particular reason to believe anything else in the Bible, including the life and resurrection of Christ.
Getting anti-evolutionists to understand math is hopeless.