I came across a post tonight from someone professing to be a Christian, but denying the Trinity of the Lord. In other words, God the Father, God the Son and God the Holy Spirit. Some Christians deny the Trinity because they say, the Bible doesn't make mention of it. Even Catholics, who claim to believe it will probably chalk it up to tradition (I was a Catholic and this was explained to me as a mystery) as the origin of a source of contention in the body of Christ today. I'm no Biblical scholar, but people have rejected the advice of those with more letters after their name then mine, so I'll give it a go anyway. Who needs a scholar when you have the Bible, right?
First of all, the Old Testament is claimed not to mention the Trinity at all. While the it isn't overt doesn't mean it isn't there. There are references to "us" and "our" when God refers to Himself as if there was more than one person.
And God said, Let us make man in our image, after our likeness... Genesis 1:26
The term used in the Old Testament "adonai" means "my masters."
The plural form for God "Elohim" is used throughout the O.T. , if the Jews of the time were to use something as a pair the word "Elohiayim" would have come into play.
Isaiah 9:6 "For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Consellor, The Mighty God, the everlasting Father, the Prince of Peace."
There are many more veres that point to this fact. The Bible doesn't always spell this out the way we want it, but the truth is there. I believe the vaguries are there so as not to tip the Lord's hand, but this is my opinion. Even Satan reads the scriptures.
The New Testament has one verse which I'll use from 1 John 5:7.
For there are three that bear record in heaven, the Father, the Word (Jesus, the Son) and the Holy Ghost: and these three are one.
This verse is watered down or non-existent in "modern" English translations of the Bible. This is incompetence, if not outright deception. But the fact is if you deny the Trinity, you are glorifying man and if you preach this, you're preaching heresy.