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

[ED scissor hands]

I had a conversation with Christian girl yesterday and it randomly led to the subject of homosexuality.
She believes that it is perfectly acceptable to be a homosexual because you should be able to love anyone you want.
I asked her how she could say that and call herself a Christian. She became iritated. I pointed out that her Bible clearly states that it is an abomination. She finally said " I don't care what it says" and ended the conversation. The stress caused by the cognitive dissonance was pretty high.
I find Christians do this a lot. They reject what they don't like in the Bible.

You can't be a Christian unless you cherry-pick which parts you want to believe.  The bible is shot thru with contradictions.  If you read that god can do everything, and also that he can't defeat iron chariots, then you have to pick one or the other.  You can't believe both.

Atheists, on the other hand, can read the bible literally.  We can say, "That's a contradiction.  The bible has to be wrong about at least one of the two conflicting statements."

it is because of blind faith that makes the Christian follow the bible before really knowing whats in it and all the scripture with in the book, they tend to stay with the new testament and want to avoid the old testament to make their point even stronger, but you cannot take, this book and dismiss the first half and pick it up in the second half with no foundation to stand on, and so it sounds good , and God of the bible seems ,to be loving for dying for you , and this is where it gets you, and you stop to thinking all together, everyone in the faith seems to just start at the new testament , and run from their as their starting line, never to dig deep and research the origins and facts that turn out to be red flags, by then it is too late you are hooked in, and there is no more ways to reason,