The following paper is based on some of the Slovak authors composing in the first half of 20th century reflecting religious though of T. G. Masaryk. The paper detects three basic thesis of Masaryk's religious philosophy in these reflections. Furthermore, it examines whether theological thoughts are unchangeable or are possibly being historically modified. Masaryk considers theology as mythology that is in conflict with science. According to present knowledge theological thoughts are denoted as irrelevant. The paper aims to theological thoughts should not be defended as an objective truth and as a relevant ontological theory. The conflict belief and science is artificial, because both phenomena means essentially different attitude in examination and explanation of the world. The religion is not just a theory for Masaryk, but above all life praxis.