I have studied that they believe the Old Testament god was evil and that Jesus came to reveal the true God. Here's my interpretation of this....

The God of the "Old Testament" doesnt exist in my opinion. The Old Testament was based on Sumerian mythology and also some Zoroastrian beliefs such as an afterlife and the concept of good and evil. However, the point is that because we live in a dual reality, we have to bring balance to good and "evil". The Gnostic Gospels claim that everything that looks evil is not really evil. Its the material lusts in this world that are evil and should be avoided.

The OT gave people ridiculous laws and ordered the deaths of those who defied him...especially homosexuals. Jesus fulfilled the law through compassion, which is balance between good and evil. I get a lot of shit from Christians when I tell them that Jesus technically sinned against God by not killing the prostitute Mary Magdelene when she was caught in the act. That OT law states that she must be killed! Instead, Jesus forgives her and according to Gnostic literature, marries her and has a daughter. The Gospel of Philip is concerned with the Gnosis of Sacred Union....coming together of man and woman.

I see the whole Bible has a balanced positive (NT) and negative (OT).

Make a little more sense?