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

[Tonus]

Freewill/life/existence is a bad deal? This is the kind of ingratitude God has to deal with, he worked his fingers to the bone on this universe you know with the amount of fine tuning he had to do. And now you're moaning about it and saying it's a bad deal!

Now I'm wondering if your reading comprehension is just that bad, or if you are misrepresenting my comments on purpose.

God imposed a bad deal on us, by forcing us to sin and then offering the cure for something he forced on us. Two humans turned against god, and the rest never got the option to make the choice that Adam and Eve made. Either god is terrible at planning, or he arranged this purposely. He wants us to be grateful to him for giving us a cure when he could have simply not infected us in the first place.

God makes it so that we cannot avoid sin, yet you call this "free will" and treat it as a gift. That is insane.

The desired outcome had an unavoidable undesirable result but he cunningly found a way to get around that issue.

If the result was unavoidable then god is not the creator, or he is such a poor designer that he locked himself out of his own sloppy design and is taking his own incompetence out on humanity. What a prick!

You compel yourself if you have freedom of will.

If you have to contradict yourself in order to make sense of your beliefs, you should probably scrap them and find something more coherent.

The concept of free will is not compatible with having a genetic propensity to "sin" deliberately coded into our DNA, all so that god can offer to remove the defect if we just kiss his ring (and the attendant eternal punishment if we simply go along with the compulsion he coded into our genes.). At the least, it is contrary to the notion of a just or loving deity who only wants what is best for us.