How can a Christian reject part of the Bible and still call themselves a Christian?

[FallentoReason]

I tend to see the trinity etc. as a sort of electrical circuit, and it's one that short circuits. Yes, God created the problem. Which means God then forgives himself by sacrificing himself to himself, so that he no longer has the problem that he created himself. Now, where do we enter the picture? There is no meaningful flow between him and us. It just revolves around his doings, and we're on the sideline.

Aren't we the ones who sinned and the ones who need to be freed from death? The atonement was all for us. God never sinned, so there was no need to atone for himself.

"We" didn't sin. God created the conditions for A&E to eventually sin without knowing what they had done, because only through the tree could they hold the ability to know. It's like being accused of breaking a law without being taught what the legal system is. Once again, that's God's slip up.