Conservative Christian schools consistently earn higher standardized test scores than public schools while being criticized for using inferior curricular materials. This research investigates the effectiveness of Christian-published science textbooks in preparing students for the science reasoning subtest of the American College Testing. Data provide a sketch of the typical Midwest Christian high school and illuminate the rationale for endorsing one publisher-type versus another. Analysis indicates no statistical difference between the mean ACT science reasoning scores of schools using Christian-published science textbooks and those using secular-published textbooks. Multiple regression analysis also shows no significant difference in the effectiveness of two Christian publishers. (Contains 6 tables and 3 figures.)