I'm honestly confused by this concept.
There is one God, but God is the Father and the Father sent his Son, who is also God to Earth, after filling Mary (the mother of God the Son) with the Holy Spirit that is also God.
Could someone please explain this in the simplest terms possible? They are three different things, but together they make up one God, but are also independently God?
I'm not sure it's possible to explain this in simple terms. It's an extremely complex doctrine. (And quite honestly, something that will probably not ever be fully and completely resolved) I think it's possible for Christians to differ on the exact composition of the Godhead and yet be saved, so while it's a big thing, it's not the single biggest. (I'd say that would be faith in salvation through the death of Jesus Christ, the Son of God.) But, I'll try and explain it a bit:
You are a Person. That is, a being with rights, and ideas,, and sapience, and an existence, among other things. (Note that human is not the same as person -- a human leg is not a person, but a part of one, and E.T. would be a non-human person, and so on.) As a person, you exist -- simple enough, right? But the question is, what do you exist of? Well, the simplest answer seems to be material stuff. Bones and muscles, complex molecules, protons and neutrons, etc. Most Christians would say there's a non-physical existence as well, but that's a secondary argument -- the point is that you're a
Person (Godwynn) with the
Substance of (Godwynn).
This leads us to the Trinity. Each member of the Trinity is a person. But what makes the Godhead, or Trinity, one God instead of three is that these three persons share the same substance. So Jesus is the
Person (Jesus Christ) with the
Substance of (Godhead). And the Father is the
Person (God the Father) with the
Substance of (Godhead), and the Spirit is the
Person (Holy Spirit) with the
Substance of (Godhead). The reason this is confusing is because we're using to thinking of substance as a material thing, and we tend to think of physical substances as being one thing or another, but not separate things at the same time. (I don't think that's necessarily true, but that's how we normally think, so I'll leave that issue alone for now) But God doesn't consist of physical substance, but rather of spiritual, which certainly can have this property of existing in multiple persons.
I think it's fair enough to decide that you don't think this doctrine is
true, but it's not inherently incomphrensible, either. It's just difficult, and requires thinking of things differently from how we normally think. (Which, I feel I should add, isn't terribly unusual, since we're talking about
God)
Did that help at all? I can try to explain further (here, on PM, or in fiftychat) if you like.
That's an easy one.
There were several versions of the original Christ story in circulation which could not all be reconciled, especially not theologically, so the only way to do so was to make God/Jesus into 3 entities, thereby allowing him to be fill 3 roles all at once.
No. Even from the earliest records, there was a distinction between Jesus and the Father, from the Spirit/paraclete that comes after Christ. You can argue if you like that these were unnecessarily conflated later on, but saying that they came from various versions of
Christ is nonsensical, since they were clearly distinct persons, even from the beginning.