 199 (or about 12.48% of the population) belonged to no church, are agnostic or atheist, and 52 individuals (or about 3.26% of the population) did not answer the question.Grellingen sits on the Basel–Biel/Bienne line and is served by local trains at Grellingen.In Grellingen about 582 or (36.5%) of the population have completed non-mandatory upper secondary education, and 141 or (8.8%) have completed additional higher education (either university or a "Fachhochschule").