Thanks, Nick.
No, the Trinity is not explicit in the Bible. An evangelical I know said that the Trinity is taught in the Bible, but not defended in the Bible. So the point is that just because there is no exact verse in the Bible that defines the Trinity, is not an argument against it, because there are so many other beliefs many people have that are not stated directly in scripture either.
To stick with the Trinity for a moment longer:
Actually, “trinity,” or “triplex” is somewhat incidental to the doctrine. This was mentioned by someone earlier in the thread, that Augustine put it this way:
The Father is God.
The Son is God.
The Holy Spirit is God.
The Father is not the Son.
The Father is not the Holy Spirit.
The Son is not the Holy Spirity.
There is only one God.
That is a succinct summary of the idea. Notice there is no mention of three, or trinity.
No, I’m sure that the first century Christians didn’t think of the Trinity as we do today. But, of course, that doesn’t mean that they didn’t believe in the divinity of Christ nor of the Holy Spirit. So I don’t think the idea was foreign and absent for them. In my opinion they did accept Jesus’ Godship, because they were told that orally by the apostles and missionaries of that time. This means that Christians didn’t have to puzzle over scripture to discover that, because they already knew it. Heck, they couldn’t even, because they didn’t have a New Testament to puzzle over!
Ignatius of Antioch in about 110 speaks of Christ being God. This is way too early for that belief to have come about from reading scripture. It could only have come from the direct apostolic teaching in his church. Subsequent early writers bear similar witness.
The belief that Jesus was God, I believe, came easily to the first century believers, both orthodox or not. This is because if Jesus is God the Father, how could the Father suffer and die? He couldn’t, it would make no sense. Therefore, it was only in appearance, not in actuality. He only seemed to suffer and die. Kind of a phantom, not in the flesh at all. This was the gnostic or docetic viewpoint. That is why, in 1John 4:2, John warns us about false prophets, “By this you know the Spirit of God: every spirit that confesses that Jesus Christ has come in the flesh is from God.”
These were those who so firmly believed in Christ’s Godship, that they didn’t see how He could have come in the flesh, but must have only appeared to have done so! And so John warns against those who didn’t believe in Christ’s flesh. In that way the gnostics and docetists were not orthodox.
I think this is evidence of first century belief in the deity of Christ.