I’m Trinitarian, and no I can’t explain the Trinity. No one can.
Can you explain how consciousness works to your dog? Yeah? Well God had the same problem when it came to explaining His nature to us and the disparity was a lot larger let me tell you.
So, no whining about the Trinity.
Do you have to believe it to be a Christian?
No way. Shut up! (Molly always says that to me…makes me laugh).
The various New Testament writers? They didn’t touch it. They talked cleverly about Jesus being God, and quietly about the Spirit being God, and more loudly about the Father being God. Then they reaffirmed there was only One God. Hear O’ Israel! (and all of that ruck-ass).
And not a single word of explanation.
They wanted us to experience God in Christ, not talk a lot of nonsense about it. Now, bring up the Trinity in a chat room and watch them GO!
Me? Not so much. Here’s a good book by my friend, and mentor, Darrell Johnson called Experiencing the Trinity. I highly recommend it and anything else written by him.