The church has always been faced with heretical teachings. This article introduces Sabellius, and his teaching on the doctrine of God. It shows also how the church responded to it, and how it concerns the church today.

The church has always been faced with heretical teachings. This article introduces Montanus, and his teaching known as Montanism. It shows how the church responded to it, and how it concerns the church today?

The church has always been faced by heretical teachings. This article introduces Gnosticism, its origin and teachings. It shows how the church responded to it, and how it relates to the church today.

The church has always been faced by heretical teachings. This article introduces Marcion and his heresy that attacked Scripture. It also considers how this relates to the church today.

The church is called to stand against heretical teachings. What is heresy? This article gives a definition and shows that at the root of heresy is the work of Satan.