Hi, Pagan. Great questions! So a simple (perhaps oversimplified?) way some Christians use to describe the Trinity is this:
God is one what in three who's.
The what, or thing, or it of God can also be called the substance or being of God, of which there is only one.
The who's of God are of course the Father, Son and Holy Spirit, which are persons who are distinct but not separate.
So there is one God in three persons.
There are also people who are Christians but deny the trinitarian doctrine, such as Oneness Pentecostals, some Church of God denominations, some Unitarians and Mormons and others. So one shouldn't assume a self-protest Christian accepts the idea.
So God is a what.
And a who, a when, and a
where, but not a why?
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