With the advent of Christianity, the goal of the Mysteries had been fulfilled. Now the New Mysteries to prepare humanity for the future had to be developed. Great debates commenced between those who continued their love for the Mysteries (or for Hebraic traditions) and those trying to blaze a new way.
For an example of ancient texts,
click here for The Apocryphon of John
Marcion, 85-160 AD, Is Yahweh the Father in the Trinity?
Mani, 216-276 AD, Son of the Widow, Paraclete
Arius, 256-336 AD, Opposer of Co-Equal Trinitarianism
Julian the Apostate, 331-363 AD, Restoring the Mysteries
Nestorius, 386-451 AD, Distinguishing Between Jesus and Christ
Justinian, 483-565 AD, Destroyer of the Mystery Remnants