A short defention of Syncretism:

yoinked directly from http://www.fact-index.com/s/sy/syncretism.html

Syncretism is the belief in the merging of various schools of thought. It is especially associated with the attempt to merge, analogize or assert the underlying unity of several originally discrete traditions, especially in religion and mythology .

Examples of strongly-syncretist movements include postmodernism, theosophy and the New Age movement.