In the 4th and 5th centuries, the core heretical ideas arose that reappeared occasionally until the Middle Ages that only a chosen few had the special and full knowledge necessary for salvation (gnosis). It was the Christian authorities that defined such doctrine. Now just who were the Christian authorities? It was the Roman Empire in its embracing of the Christianity for political purposes that were the authorities. Wow! What do we see today in the entire world? Is it not the government leadership in each country telling its citizenry what is their religion, when and even if they can hold worship services and then telling us who and how many in what circumstances can we attend any services? The playbook from the beginning of time crafted by satanic followers is alive and well today.
Gnostics believed that they were purer than all others. Some even held that the material world needed to be completely rejected, leading the heresy of Docetism (Jesus, being pure divinity, only appeared to be human – docere “to seem”) because matter (earth elements) would have tainted Him. This idea closely relates to the Law of Dualism. However, instead of interpreting this Law correctly, the Manichees contended there was a good god who created the spirit realm and a bad God who created matter, which had to be rejected for salvation. Dualism appeared again in the 12th century at the heart of the Albigensian or Cathari heretical movement.
The Law of Duality. Basically, the definition here is in everything there is an opposite - good vs. evil, love vs. hate, light vs. darkness, healthy vs. unhealthy, prosperity vs. poor, abundant vs. lack, etc. etc. When Adam and Eve ate the fruit from the Tree of Knowledge and opened their minds to this knowledge of good and evil, they immediately understood that they now live in a world of duality. We have within us both the good and evil. Good is the soul of God given to us in this physical body and evil being the EGO created by our mind! Through our free will of choice, we can either live a life of EGO or a life in-Spirit. It is only when we are in-Spirit are we able to use the attributes of our Source to co-create our Life experiences.
Also, in the 4th century, a major theological heresy called Arianism emerged from a priest of Alexandria who taught that Jesus was fully human without any divinity. This started a number of other heresies. Adoptionism held that the Father adopted the human Jesus as God's Son and raised him nearly to divinity. Modalistic Monarchianism contended that God was always one, but never three--in turn, Father and then Son and then Holy Spirit. Others held that Jesus was created by the Father and therefore not co-eternal and co-equal to the Father, which Arius captured in his statement about Jesus, "There was a time when he was not."
All these debates plus others were settled by the Church's first four general councils (Nicaea I in 325, Constantinople I in 381, Ephesus in 431, Chalcedon in 451) set the creed and declared all other statements heretical. However, these general councils, while seemingly solving theological issues, only cause other issues to raise their