This document summarizes a dissertation that investigated the relationships between religious fundamentalism, need for closure, and scientific reasoning in college students. The study surveyed 101 college students to measure their levels of religious fundamentalism, need for closure, and scientific reasoning ability. Pearson correlations revealed that religious fundamentalism and scientific reasoning were negatively correlated, while need for closure was not correlated with either variable. Regression analyses found that religious fundamentalism significantly predicted lower scientific reasoning scores, but need for closure did not mediate this relationship. The results provide further evidence that dogmatic religious beliefs like fundamentalism can inhibit the development of scientific reasoning abilities.