Historical Vedic religion the central ideas and theosophy in the Vedas, and synergistically integrated new ideas. Of the major traditions that emerged from Brahmanism are the six "darshanas", particular the Vedanta, Samkhya and Yoga schools of Hinduism. Vedic religion was followed by Upanishads which gradually evolved into Vedanta, which is regarded by some as the primary institution of Hinduism. Vedanta considers itself "the purpose or goal [end] of the Vedas." There are some conservative schools which continue portions of the historical Vedic religion largely unchanged (see Śrauta, Nambudiri). Of the continuation of the Vedic tradition in a newer sense, Jeaneane D. Fowler writes
Ancient Mesopotamian religion complex and difficult subject because, by nature, their religion was governed only by usage, not by any official decision, and by nature it was neither dogmatic nor systematic. Deities, characters, and their actions within myths changed in character and importance over time, and occasionally depicted different, sometimes even contrasting images or concepts. This is further complicated by the fact that scholars are not entirely certain what role religious texts played in the Mesopotamian world. For many decades, some scholars of the Ancient Near East argued that it was impossible to define there as being a singular Mesopotamian religion, with Leo