Wikipedia defines Syncretism as:

the combining of different beliefs, while blending practices of various schools of thought. Syncretism involves the merging or assimilation of several originally discrete traditions, especially in the theology and mythology of religion, thus asserting an underlying unity and allowing for an inclusive approach to other faiths. From my https://medium.com/technical-excellence/i-do-not-believe-that-any-god-desires-worship-39268e70d0b8