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

[Tonus]

The only way to remove it would be to remove freedom of will.

Not true. You are conflating two different concepts. There is the idea that having free will would give us the option to do things that god disapproves of. Then there is the idea that we are forced to sin in order to have free will. The second requires a deliberate act on the part of god to force us to commit sin.

Paul admitted this, as most Christians do; they want only to do what god approves of and to avoid sin, but they cannot help it. That is not freedom, because you are forced to commit acts that you do not want, and that in many cases cause the Christian to feel anguish. That is freedom with strings attached, which is no freedom at all.

The whole entire idea is that God doesn't punish you for your sin, it doesn't matter how big a sin we're talking about. The offer is 100% forgiveness guaranteed.

Only if you accept the antidote for the virus god infected you with, and if you pretend that it isn't his fault that you needed the antidote in the first place. God wants to abuse you and have you thank him for it.

The only way to do that is to remove our freewill.

Untrue, see above. The Bible even shows how god mocks the condition that he inflicted on humanity, by putting on a human costume and walking about the Earth, never committing a single sin and even letting the humans "kill" the costume before he returned to heaven. The message: this could be you... if I wasn't such a sadistic prick!

Ok so you're not really listening to a single word of any of it fair enough.

Listening? Yes. Able to accept that nonsense as real? No.