Why were the secret teachings of the original Christians brutally suppressed by the Roman Church?

Because they relate the myth of the Christian Goddess Sophia.

Because they portray Jesus and Mary Magdalene as mythic figures based on the Pagan dying and resurrecting Godman and the fallen and redeemed Goddess.

Because they show that the gospel story is a mystical allegory encoding a profound philosophy which leads to Gnosis - mystical enlightenment.

Because they undermine external authority by directly revealing the Christ within.

Because they have the power to turn the world inside-out and transform life into an exploration of consciousness.

I would recommend reading Timothy Freke and Peter Gandy's Jesus and the Lost Goddess. You will get a wider appreciation of the wealth of knowledge that formed early Christianity.

Dr Deepak Chopra
Author of The Seven Spiritual Laws of Success and How to Know God