That has nothing to do with evolution; it's not witty, it's crude; it doesn't use an Islamic symbol, and it's not directed specifically at fundamentalist Islam.
In other words you are too chicken to post an anti Fundamentalist Islam symbol or wear an anti-Fundamentalist Islam T-Shirt, but you feel free to walk into class wearing a desecrated Christian Ichthus symbol to show your distaste for Fundamentalist Christians. Well lets see you publicly show your distaste for Funadamentalist Islamicists. Wear something like that to teach your class. I dare you.
Put up or shut up.