Liesing has one of the highest population shares of people with Roman Catholic faith, %, compared with Vienna overall at %, due to a very low foreign share. Eleven Catholic Parishes form the town Deconate 23 in the municipality. On the other hand, the proportions of people with Islamic faith with %, and of Orthodox faith, with %, are both below the average (Vienna citywide: % or 6%). The proportion of the Evangelical people was % of the district population, the second highest in Vienna. Nearly % of the district population, in 2001, belonged to no religion, where this was the 3rd highest value of a Vienna district. Another % of the population had expressed either none or some other religion.