 1,319 (or about 15.64% of the population) belonged to no church, are agnostic or atheist, and 280 individuals (or about 3.32% of the population) did not answer the question.In Therwil about 3,677 or (43.6%) of the population have completed non-mandatory upper secondary education, and 1,563 or (18.5%) have completed additional higher education (either university or a "Fachhochschule").Of the 1,563 who completed tertiary schooling, 62.7% were Swiss men, 25.0% were Swiss women, 7.4% were non-Swiss men and 5.0% were non-Swiss women.