In the present article author describes a relationship between national stereotypes and religiousness, secularism and national identity. Religiousness is a central dimension of the social construction of reality and takes sufficient attention of phenomenologists and sociologists of knowledge, such as Peter L. Berger and Thomas Luckmann. The author, starting from the phenomenological theory built on the paradigm of the sociology of knowledge, analyses the results of a survey conducted among Polish students and high school students between 2007 and 2013. Observing the statements of Polisch youth, author searches correlations between variables such as religiousness, irreligiousness, national identity and the opinions of respondents on the Germans. Created indexes of religiousness and irreligiousness are compared with the extremely unfavorable statements or positive statements about the Germans. Then those indexes are correlated with an index of national identity of respondents, what verifies the hypotheses.