This document provides a literature review on sectarianism in Scotland, specifically regarding football. It discusses different definitions of sectarianism, with religious divisions seen as a core component but also branching into political, cultural, and historical differences. Religion is viewed by some as an essential factor, while others argue the religious link has declined in modern Scotland. The review examines the importance of religion in contemporary Scottish society, noting Scotland's sectarian past but that the worst discriminatory laws have been repealed. It finds little evidence that economic outcomes in Scotland favor any particular religion. Overall, the review explores how sectarianism is understood and debates the ongoing significance of religious divisions.