The objective is to test if religiosity affects environmental opinion in Europe. Using data from European Social Survey (ESS) 2002/2003, the study answers three questions. At societal level: Is the public opinion about environment different in political systems with separate Christian traditions? Is the environmental concern less or higher in the public opinion depending on the degree of secularization in the political systems? At individual level: Is the environmental opinion of the individual affected by the personal confession of faith, religious involvement and the dominant religious context? At societal level, the findings show stronger concern for environment in Catholic and Eastern Orthodox countries than in Protestant countries. The tendency also show a weaken concern for environment in countries with a rather secular population. At individual level, there are significant positive effects on environmental care from Catholic culture, negative effect from Protestant culture, and no effect from religious involvement.