As antagonism, misinformation, and siloing proliferates on the internet, young people need the skills of critical thinking and argumentation now more than ever. Belief Map is an interactive tool that helps students deconstruct their own beliefs and learn to understand and challenge the beliefs of others without attacking them. Students express their beliefs graphically by marking a position on a claim represented by a 2-dimensional plot. They evaluate sources of information relevant to that claim, and update their belief in light of the evidence. Finally, a discussion protocol and reflection activity guides students through engaging with people who hold different views.