The Trinity Defined and Refuted
by Sean Finnegan
Three Persons in One God
The Trinity is probably the most misunderstood doctrine in Christianity. Non-Trinitarians often do not take the time to understand the Trinity and so craft great arguments against modalism all the while thinking they have debunked the Trinity. For this reason, I have endeavored to define each of the aspects under consideration before trying to refute them. The first point that needs to be explained is the essential understanding of three persons in one God. The entry below is informative:
In Christianity, the doctrine of the Trinity states that God is one being who exists, simultaneously and eternally, as a mutual indwelling of three persons: the Father, the Son (incarnate as Jesus of Nazareth), and the Holy Spirit. Since the 4th century, in both Eastern and Western Christianity, this doctrine has been stated as “one God in three persons,” all three of whom, as distinct and co-eternal persons, are of one indivisible Divine essence, a simple being…The doctrine of the Trinity is the result of continuous exploration by the church of the biblical data, thrashed out in debate and treatises, eventually formulated at the First Council of Nicaea in 325 AD in a way they believe is consistent with the biblical witness, and further refined in later councils and writings.
According to the Trinity, there are three separate “persons” in one divine “substance.” These separate persons are the Father, the Son, and the Holy Spirit. The belief of the Trinity is a paradox − the Father is God; the Son is God; the Holy Spirit is God; yet, there are not three Gods, but one. In fact, the Father is not the Son, the Son is not the Holy Spirit, and the Holy Spirit is not the Father. This concept is illustrated below.
Thus, God is not believed to be a person; rather, God is an essence that the Father, Son, and Holy Spirit share in common. Imagine for a moment a three-headed man. Each head has its own mind (thoughts, intentions, memory, feelings, preferences, etc.). Although there are three minds (persons), there is only one body. At first this seems like a good analogy to represent what is being said by the definition of the Trinity. However, this analogy breaks down at the next step because, according to the Trinity, each person not only shares the same substance (God), but each is fully God. Our three headed person analogy falls short here because each head is not fully the man; rather, each is a part of him. In fact, every analogy to anything in the known universe breaks down at this point. The shamrock analogy, the egg analogy, the three phases of water analogy, etc., all fail to represent what has been defined in the above diagram …..
See the original sources on how Trinitarian fallacy is unveiled ;