When religions blend or add ideas from other religions, the process is called Syncretism.
Syncretism refers to a process of blending the culture and beliefs of two religions together in a new system. Syncretism can also be referred to as the fusion of diverse religions and cultures.
The ideas from other religions are added to the familiar religion in Syncretism.
Therefore the correct option is A.
Learn more about Syncretism here:
https://brainly.com/question/5151827