The cults of deities like Isis and Mithra were introduced into the Greek world. Greek-speaking communities of the Hellenized East were instrumental in the spread of early Christianity in the 2nd and 3rd centuries, and Christianity's early leaders and writers (notably St Paul) were generally Greek-speaking, though none were from Greece.
What religions form of worship came from the Eastern sects ?
The cults of deities like Isis and Mithra were introduced into the Greek world.