Choose the "Jew" class, then talk to Priest Maxi outside City Hall, sitting on a bench to the left of the path. He will tell you to find Jesus. Go two screens to the left to reach the church. Enter the church to find Jesus hiding behind some chairs in the middle of the church, on the right. Return to Priest Maxi, and you will be tasked with finding Jesus again. Go back to the church, and turn off the lights to the right of the podium. Then, you will see Jesus' shadow on the wall. Go to the podium to find him again and get the "Are We Cool?" achievement.