The Trinity that many Christians hold to says that there is one God who consists of three persons. Do we find this in the Scripture? No. There is nothing in the Scriptures that says there is one God who consists of three persons. So what do we find in the Scripture? We find the Father and the Son. I would submit that the Holy Spirit which is mentioned in the Scriptures is a limited manifestation of the Father. Let's look at the Scriptures.
Jesus said that God was His Father. So, the Father is the Father of Jesus. However, we see in Scripture that the Holy Spirit came upon Mary and she conceived. But, Jesus said God was His Father. The only way to reconcile this is if the Holy Spirit is the Father. Paul also speaks of the God and Father of Jesus Christ. Let's continue.
But if I with the finger of God cast out devils, no doubt the kingdom of God is come upon you. (Lk. 11:20 KJV)
But if I cast out devils by the Spirit of God, then the kingdom of God is come unto you. (Matt. 12:28 KJV)
Here we have the same event from two different Gospel writers. According to Luke, Jesus cast out devils by the finger of God. Mathew says it was by the Holy Spirit. How do we reconcile these passages? Either one of them is wrong, or the Father is the Holy Spirit. Let's continue.
Jesus said no one knows the Father except the Son and no one knows the Son except the Father.
All things are delivered unto me of my Father: and no man knoweth the Son, but the Father; neither knoweth any man the Father, save the Son, and he to whomsoever the Son will reveal him. (Matt. 11:27 KJV)
So, how is there a third person that doesn't know the Father or the Son? Supposedly there is a third person in the Godhead, yet he doesn't know the Father or the Son.
In this Trinity it is said that there is one God in three persons. Is there one being called God? In the Old Testament, God was called Jehovah, In Genesis we see the Lord and three angels appear to Abram. The two angels go on ahead to Sodom and Gomorrah to get Lot out of the city. The Lord remains with Abram. After speaking with Abram the Lord goes on to Sodom and Gomorrah. This is what we find.
Then the LORD rained upon Sodom and upon Gomorrah brimstone and fire from the LORD out of heaven; (Gen. 19:24 KJV)
In this verse the word LORD is capitalized because it is the word Jehovah. So, in this passage we have Jehovah on earth calling down fire and brimstone from Jehovah in Heaven. We have two beings both called Jehovah. Two beings called God.
If there are three persons in the Godhead, We have to wonder why Paul doesn't mention the third one in his greetings. When Paul writes to the churches his greeting is always something to the effect, grace to you and peace from God our Father and the Lord Jesus Christ. One has to wonder why Paul never mentions grace and peace from the Holy Spirit, if the Spirit is a third person.
We don't have to wonder why Paul does this. We can see what he believed simply by looking at his words to the Corinthians. He said to them, 'to us there is one God, the Father and one Lord Jesus Christ. Again, no mention of a third person. But his statement is crystal clear, 'to us there is one God, the Father'. He didn't say there is one God, the Father, Son, and Holy Spirit. He said, one God, the Father.
If there is a Trinity of three coequal persons, how does Jesus, the Son, have a God? If Jesus has a God then that God is higher than Jesus, not coequal.
When we look at the Scriptures we find that the word Spirit is in the neuter gender. It should be translated as "it". If your translation says "he" when referring to the Spirit it is wrong. The word spirit is not masculine. The only place that the spirit is referred to as he that is correct is when Jesus speaks of the comforter. However, the pronoun is masculine because the word comforter is masculine and the Greek language requires that the pronoun match the noun in gender.
We can also look at the historical evidence. We don't find this idea of one God in three coequal, co-eternal persons until around the late 4th or early 5th century. I appears in the Athanasian Creed. So, the Trinity is not in the Bible, not mentioned by Jesus or the apostles, and doesn't appear until around the 4th century. I think the evidence against it is overwhelming