The basic story is that we are stained by original sin, or sins we've committed, or by being sinful beings by design, and only animal sacrifices could save us from God's wrath until Christ allowed himself to be betrayed, marched through the streets of Jerusalem in shame, and then killed by crucifiction. .... then he gets put into a tomb (typical of the time) and then disappears from it, and then appears to people, Elvis-style, for a time... and then goes to live with God.
...except that he is God. And in the story, he cries out to God, "Why hast thou forsaken me?" Now, if he was so powerful that he could have liberated himself if he'd wanted to, why would he say that? And why refer to God in the second and third persons? And if he could decide to forgive us via his "sacrifice" of being dead for part of a weekend, why not just decide to forgive us just cuz? They're his rules. He can change them... unless he's not all-powerful.
So... the Trinity is problem for several reasons:
- Jesus refers to himself as "Son of Man"
- Jesus refers to God in the second and third person
- Jesus didn't have the power to jump off the cross
- Jesus was expecting God to intervene for him
- Jesus as half-God and half-human was more in keeping with stories of his time
- Jesus didn't willingly sacrifice himself - he could have turned himself in rather than be betrayed
- In the cannibalistic meal he references himself as a sacrifice, but sacrifice to whom? Can a god be sacrificed to appease himself? That's just plain messed up.
- Jesus says the "father" acts through him, not that he is his own father
- Jesus "sits at the right hand" of God. How can God sit next to himself?