Last Thursdayism.
A great example of YEC ideas being a distraction to Evangelism, God planting things in the past to look older than they appear. This would imply that God is a deceiver, a distinctly unChristian concept. However, it would be perfectly acceptable in Islam since in that religion, God's Sovereignty is absolute, even over truth. The Islamic conception of God implies that God can change the truth at a whim. As I said before to others, this is one of the reasons that the practice of the scientific method went further in the Medieval Christian World while the Islamic World eventually gave up on pursuing the scientific method